Mercurial > repos > blastem
annotate sms.c @ 1374:8f404b1fa572
Go back to resetting the refresh counter after a DMA. Probably not quite correct as it is probably reset on VDP triggered refresh, but this is close enough for now given the general limitations with my refresh code. VDP FIFO Testing seems to be passing 100% reliably again (was occassionally failing still with the last commit)
author | Michael Pavone <pavone@retrodev.com> |
---|---|
date | Tue, 23 May 2017 23:47:40 -0700 |
parents | 5b20840711c1 |
children | e587f16e7d3d |
rev | line source |
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1117
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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1 #include <string.h> |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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2 #include <stdlib.h> |
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Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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3 #include <stddef.h> |
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Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
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4 #include "sms.h" |
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Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
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5 #include "blastem.h" |
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Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
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6 #include "render.h" |
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Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
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7 #include "util.h" |
1129
6b5c92b6205c
Enabled Z80 debugger in PBC mode
Michael Pavone <pavone@retrodev.com>
parents:
1126
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8 #include "debug.h" |
1117
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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9 |
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Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
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10 static void *memory_io_write(uint32_t location, void *vcontext, uint8_t value) |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
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11 { |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
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12 z80_context *z80 = vcontext; |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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13 sms_context *sms = z80->system; |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
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14 if (location & 1) { |
1154
c83ec07ddbac
Implemented Mode 4 H conter latching
Michael Pavone <pavone@retrodev.com>
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1149
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15 uint8_t fuzzy_ctrl_0 = sms->io.ports[0].control, fuzzy_ctrl_1 = sms->io.ports[1].control; |
1143
d4d770cfbc62
Fix handling of IO control writes in SMS mode
Michael Pavone <pavone@retrodev.com>
parents:
1142
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16 sms->io.ports[0].control = (~value) << 5 & 0x60; |
1154
c83ec07ddbac
Implemented Mode 4 H conter latching
Michael Pavone <pavone@retrodev.com>
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1149
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17 fuzzy_ctrl_0 |= sms->io.ports[0].control; |
1143
d4d770cfbc62
Fix handling of IO control writes in SMS mode
Michael Pavone <pavone@retrodev.com>
parents:
1142
diff
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18 sms->io.ports[1].control = (~value) << 3 & 0x60; |
1154
c83ec07ddbac
Implemented Mode 4 H conter latching
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parents:
1149
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19 fuzzy_ctrl_1 |= sms->io.ports[1].control; |
c83ec07ddbac
Implemented Mode 4 H conter latching
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parents:
1149
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20 if ( |
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Implemented Mode 4 H conter latching
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21 (fuzzy_ctrl_0 & 0x40 & (sms->io.ports[0].output ^ (value << 1)) & (value << 1)) |
c83ec07ddbac
Implemented Mode 4 H conter latching
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1149
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22 || (fuzzy_ctrl_0 & 0x40 & (sms->io.ports[1].output ^ (value >> 1)) & (value >> 1)) |
c83ec07ddbac
Implemented Mode 4 H conter latching
Michael Pavone <pavone@retrodev.com>
parents:
1149
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23 ) { |
c83ec07ddbac
Implemented Mode 4 H conter latching
Michael Pavone <pavone@retrodev.com>
parents:
1149
diff
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24 //TH is an output and it went from 0 -> 1 |
c83ec07ddbac
Implemented Mode 4 H conter latching
Michael Pavone <pavone@retrodev.com>
parents:
1149
diff
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25 vdp_run_context(sms->vdp, z80->current_cycle); |
c83ec07ddbac
Implemented Mode 4 H conter latching
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1149
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26 vdp_latch_hv(sms->vdp); |
c83ec07ddbac
Implemented Mode 4 H conter latching
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parents:
1149
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27 } |
1117
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
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28 io_data_write(sms->io.ports, value << 1, z80->current_cycle); |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
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29 io_data_write(sms->io.ports + 1, value >> 1, z80->current_cycle); |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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30 } else { |
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Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
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31 //TODO: memory control write |
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Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
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32 } |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
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33 return vcontext; |
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Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
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34 } |
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Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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35 |
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Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
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36 static uint8_t hv_read(uint32_t location, void *vcontext) |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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37 { |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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38 z80_context *z80 = vcontext; |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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39 sms_context *sms = z80->system; |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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40 vdp_run_context(sms->vdp, z80->current_cycle); |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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41 uint16_t hv = vdp_hv_counter_read(sms->vdp); |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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42 if (location & 1) { |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
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43 return hv; |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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44 } else { |
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Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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45 return hv >> 8; |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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46 } |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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47 } |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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48 |
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Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
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49 static void *sms_psg_write(uint32_t location, void *vcontext, uint8_t value) |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
changeset
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50 { |
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Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
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51 z80_context *z80 = vcontext; |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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52 sms_context *sms = z80->system; |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
changeset
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53 psg_run(sms->psg, z80->current_cycle); |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
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54 psg_write(sms->psg, value); |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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55 return vcontext; |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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56 } |
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Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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57 |
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Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
changeset
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58 static void update_interrupts(sms_context *sms) |
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Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
changeset
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59 { |
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Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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60 uint32_t vint = vdp_next_vint(sms->vdp); |
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Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
changeset
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61 uint32_t hint = vdp_next_hint(sms->vdp); |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
changeset
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62 sms->z80->int_pulse_start = vint < hint ? vint : hint; |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
changeset
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63 } |
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Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
changeset
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64 |
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Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
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65 static uint8_t vdp_read(uint32_t location, void *vcontext) |
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Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
changeset
|
66 { |
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Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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67 z80_context *z80 = vcontext; |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
68 sms_context *sms = z80->system; |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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69 vdp_run_context(sms->vdp, z80->current_cycle); |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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70 if (location & 1) { |
1126
63cd87d910cc
Clear interrupt status flags after getting the status register value rather than before
Michael Pavone <pavone@retrodev.com>
parents:
1120
diff
changeset
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71 uint8_t ret = vdp_control_port_read(sms->vdp); |
1119
55ea7f9a4e92
Fix clearing of interrupt pending flags on control port read in PBC mode
Michael Pavone <pavone@retrodev.com>
parents:
1117
diff
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72 sms->vdp->flags2 &= ~(FLAG2_VINT_PENDING|FLAG2_HINT_PENDING); |
1117
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
changeset
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73 update_interrupts(sms); |
1126
63cd87d910cc
Clear interrupt status flags after getting the status register value rather than before
Michael Pavone <pavone@retrodev.com>
parents:
1120
diff
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74 return ret; |
1117
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
changeset
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75 } else { |
1149
6b0da6021544
Don't lock up CPU if performing a read with writes configured when in PBC mode. Allow access to VDP debug commands from Z80 debugger in PBC mode. Handle Mode 4 in VDP debug print functions
Michael Pavone <pavone@retrodev.com>
parents:
1148
diff
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76 return vdp_data_port_read_pbc(sms->vdp); |
1117
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Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
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77 } |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
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78 } |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
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79 |
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Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
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80 static void *vdp_write(uint32_t location, void *vcontext, uint8_t value) |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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81 { |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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82 z80_context *z80 = vcontext; |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
83 sms_context *sms = z80->system; |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
84 if (location & 1) { |
1371
5b20840711c1
Remove HINT_FUDGE and make a small adjustment to how VDP syncs with rest of system instead. Worse results on CRAM dot issue, but much less of a hack
Michael Pavone <pavone@retrodev.com>
parents:
1326
diff
changeset
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85 vdp_run_context_full(sms->vdp, z80->current_cycle); |
1117
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Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
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86 vdp_control_port_write_pbc(sms->vdp, value); |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
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87 update_interrupts(sms); |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
88 } else { |
1371
5b20840711c1
Remove HINT_FUDGE and make a small adjustment to how VDP syncs with rest of system instead. Worse results on CRAM dot issue, but much less of a hack
Michael Pavone <pavone@retrodev.com>
parents:
1326
diff
changeset
|
89 vdp_run_context(sms->vdp, z80->current_cycle); |
1117
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Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
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90 vdp_data_port_write_pbc(sms->vdp, value); |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
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|
91 } |
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Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
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92 return vcontext; |
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Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
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93 } |
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Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
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94 |
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Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
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95 static uint8_t io_read(uint32_t location, void *vcontext) |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
96 { |
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Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
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97 z80_context *z80 = vcontext; |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
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98 sms_context *sms = z80->system; |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
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99 if (location == 0xC0 || location == 0xDC) { |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
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100 uint8_t port_a = io_data_read(sms->io.ports, z80->current_cycle); |
1148
80ef49539550
Fix reading from second controller port in SMS mode
Michael Pavone <pavone@retrodev.com>
parents:
1143
diff
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101 uint8_t port_b = io_data_read(sms->io.ports+1, z80->current_cycle); |
1117
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
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102 return (port_a & 0x3F) | (port_b << 6); |
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103 } |
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104 if (location == 0xC1 || location == 0xDD) { |
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105 uint8_t port_a = io_data_read(sms->io.ports, z80->current_cycle); |
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106 uint8_t port_b = io_data_read(sms->io.ports+1, z80->current_cycle); |
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107 return (port_a & 0x40) | (port_b >> 2 & 0xF) | (port_b << 1 & 0x80) | 0x10; |
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108 } |
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109 return 0xFF; |
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110 } |
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111 |
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112 static void *mapper_write(uint32_t location, void *vcontext, uint8_t value) |
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113 { |
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114 z80_context *z80 = vcontext; |
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115 sms_context *sms = z80->system; |
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116 void *old_value; |
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117 location &= 3; |
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118 sms->ram[0x1FFC + location] = value; |
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119 sms->bank_regs[location] = value; |
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120 if (location) { |
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121 uint32_t idx = location - 1; |
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122 old_value = z80->mem_pointers[idx]; |
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123 z80->mem_pointers[idx] = sms->rom + (value << 14 & (sms->rom_size-1)); |
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124 if (old_value != z80->mem_pointers[idx]) { |
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125 //invalidate any code we translated for the relevant bank |
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126 z80_invalidate_code_range(z80, idx ? idx * 0x4000 : 0x400, idx * 0x4000 + 0x4000); |
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127 } |
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128 } else { |
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129 old_value = z80->mem_pointers[2]; |
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130 if (value & 8) { |
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131 //cartridge RAM is enabled |
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132 z80->mem_pointers[2] = sms->cart_ram + (value & 4 ? (SMS_CART_RAM_SIZE/2) : 0); |
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133 } else { |
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134 //cartridge RAM is disabled |
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135 z80->mem_pointers[2] = sms->rom + (sms->bank_regs[3] << 14 & (sms->rom_size-1)); |
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136 } |
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137 if (old_value != z80->mem_pointers[2]) { |
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138 //invalidate any code we translated for the relevant bank |
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139 z80_invalidate_code_range(z80, 0x8000, 0xC000); |
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140 } |
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141 } |
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142 return vcontext; |
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143 } |
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144 |
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145 static void *cart_ram_write(uint32_t location, void *vcontext, uint8_t value) |
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146 { |
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147 z80_context *z80 = vcontext; |
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148 sms_context *sms = z80->system; |
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149 if (sms->bank_regs[0] & 8) { |
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150 //cartridge RAM is enabled |
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151 location &= 0x3FFF; |
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152 z80->mem_pointers[2][location] = value; |
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153 z80_handle_code_write(0x8000 + location, z80); |
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154 } |
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155 return vcontext; |
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156 } |
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157 |
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158 uint8_t debug_commands(system_header *system, char *input_buf) |
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159 { |
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160 sms_context *sms = (sms_context *)system; |
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161 switch(input_buf[0]) |
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162 { |
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163 case 'v': |
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164 if (input_buf[1] == 'r') { |
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165 vdp_print_reg_explain(sms->vdp); |
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166 } else if (input_buf[1] == 's') { |
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167 vdp_print_sprite_table(sms->vdp); |
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168 } else { |
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169 return 0; |
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170 } |
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171 break; |
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172 } |
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173 return 1; |
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174 } |
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175 |
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176 static memmap_chunk io_map[] = { |
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177 {0x00, 0x40, 0xFF, 0, 0, 0, NULL, NULL, NULL, NULL, memory_io_write}, |
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178 {0x40, 0x80, 0xFF, 0, 0, 0, NULL, NULL, NULL, hv_read, sms_psg_write}, |
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179 {0x80, 0xC0, 0xFF, 0, 0, 0, NULL, NULL, NULL, vdp_read, vdp_write}, |
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180 {0xC0, 0x100,0xFF, 0, 0, 0, NULL, NULL, NULL, io_read, NULL} |
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181 }; |
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182 |
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183 static void set_speed_percent(system_header * system, uint32_t percent) |
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184 { |
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185 sms_context *context = (sms_context *)system; |
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186 uint32_t old_clock = context->master_clock; |
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187 context->master_clock = ((uint64_t)context->normal_clock * (uint64_t)percent) / 100; |
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188 |
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189 psg_adjust_master_clock(context->psg, context->master_clock); |
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190 } |
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191 |
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192 static void run_sms(system_header *system) |
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193 { |
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194 render_disable_ym(); |
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195 sms_context *sms = (sms_context *)system; |
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196 uint32_t target_cycle = sms->z80->current_cycle + 3420*262; |
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197 //TODO: PAL support |
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198 render_set_video_standard(VID_NTSC); |
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199 while (!sms->should_return) |
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200 { |
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201 if (system->enter_debugger && sms->z80->pc) { |
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202 system->enter_debugger = 0; |
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203 zdebugger(sms->z80, sms->z80->pc); |
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204 } |
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205 z80_run(sms->z80, target_cycle); |
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206 if (sms->z80->reset) { |
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207 z80_clear_reset(sms->z80, sms->z80->current_cycle + 128*15); |
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208 } |
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209 target_cycle = sms->z80->current_cycle; |
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210 vdp_run_context(sms->vdp, target_cycle); |
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211 psg_run(sms->psg, target_cycle); |
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212 target_cycle += 3420*262; |
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213 if (target_cycle > 0x10000000) { |
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214 uint32_t adjust = sms->z80->current_cycle - 3420*262*2; |
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215 io_adjust_cycles(sms->io.ports, sms->z80->current_cycle, adjust); |
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216 io_adjust_cycles(sms->io.ports+1, sms->z80->current_cycle, adjust); |
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217 z80_adjust_cycles(sms->z80, adjust); |
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218 vdp_adjust_cycles(sms->vdp, adjust); |
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219 sms->psg->cycles -= adjust; |
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220 target_cycle -= adjust; |
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221 } |
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222 } |
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223 sms->should_return = 0; |
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224 render_enable_ym(); |
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225 } |
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226 |
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227 static void start_sms(system_header *system, char *statefile) |
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228 { |
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229 sms_context *sms = (sms_context *)system; |
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230 set_keybindings(&sms->io); |
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231 |
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232 if (system->enter_debugger) { |
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233 system->enter_debugger = 0; |
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234 zinsert_breakpoint(sms->z80, 0, (uint8_t *)zdebugger); |
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235 } |
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236 |
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237 z80_assert_reset(sms->z80, 0); |
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238 z80_clear_reset(sms->z80, 128*15); |
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239 |
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240 run_sms(system); |
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241 } |
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242 |
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243 static void soft_reset(system_header *system) |
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244 { |
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245 sms_context *sms = (sms_context *)system; |
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246 z80_assert_reset(sms->z80, sms->z80->current_cycle); |
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247 sms->z80->target_cycle = sms->z80->sync_cycle = sms->z80->current_cycle; |
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248 } |
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249 |
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250 static void free_sms(system_header *system) |
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251 { |
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252 sms_context *sms = (sms_context *)system; |
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253 vdp_free(sms->vdp); |
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254 z80_options_free(sms->z80->options); |
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255 free(sms->z80); |
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256 psg_free(sms->psg); |
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257 free(sms); |
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258 } |
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259 |
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260 static uint16_t get_open_bus_value(system_header *system) |
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261 { |
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262 return 0xFFFF; |
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263 } |
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264 |
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265 static void request_exit(system_header *system) |
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266 { |
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267 sms_context *sms = (sms_context *)system; |
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268 sms->should_return = 1; |
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269 } |
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270 |
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271 static void inc_debug_mode(system_header *system) |
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272 { |
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273 sms_context *sms = (sms_context *)system; |
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274 sms->vdp->debug++; |
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275 if (sms->vdp->debug == 7) { |
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276 sms->vdp->debug = 0; |
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277 } |
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278 } |
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279 |
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280 static void inc_debug_pal(system_header *system) |
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281 { |
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282 sms_context *sms = (sms_context *)system; |
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283 sms->vdp->debug_pal++; |
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284 if (sms->vdp->debug_pal == 4) { |
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285 sms->vdp->debug_pal = 0; |
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286 } |
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287 } |
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288 |
1201
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Use filename for game title in SMS mode
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289 sms_context *alloc_configure_sms(system_media *media, uint32_t opts, uint8_t force_region, rom_info *info_out) |
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290 { |
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291 memset(info_out, 0, sizeof(*info_out)); |
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292 sms_context *sms = calloc(1, sizeof(sms_context)); |
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293 uint32_t rom_size = nearest_pow2(media->size); |
1141
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Initial support for Sega's family of SMS mappers
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294 memmap_chunk memory_map[6]; |
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295 if (media->size > 0xC000) { |
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296 info_out->map_chunks = 6; |
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297 uint8_t *ram_reg_overlap = sms->ram + sizeof(sms->ram) - 4; |
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298 memory_map[0] = (memmap_chunk){0x0000, 0x0400, 0xFFFF, 0, 0, MMAP_READ, media->buffer, NULL, NULL, NULL, NULL}; |
1142
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Invalidate translated code on a cartridge bank change in SMS mode. Fix handling of bank 0
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299 memory_map[1] = (memmap_chunk){0x0400, 0x4000, 0xFFFF, 0, 0, MMAP_READ|MMAP_PTR_IDX|MMAP_CODE, NULL, NULL, NULL, NULL, NULL}; |
5c8b1c33ca10
Invalidate translated code on a cartridge bank change in SMS mode. Fix handling of bank 0
Michael Pavone <pavone@retrodev.com>
parents:
1141
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300 memory_map[2] = (memmap_chunk){0x4000, 0x8000, 0x3FFF, 0, 1, MMAP_READ|MMAP_PTR_IDX|MMAP_CODE, NULL, NULL, NULL, NULL, NULL}; |
1149
6b0da6021544
Don't lock up CPU if performing a read with writes configured when in PBC mode. Allow access to VDP debug commands from Z80 debugger in PBC mode. Handle Mode 4 in VDP debug print functions
Michael Pavone <pavone@retrodev.com>
parents:
1148
diff
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301 memory_map[3] = (memmap_chunk){0x8000, 0xC000, 0x3FFF, 0, 2, MMAP_READ|MMAP_PTR_IDX|MMAP_CODE, NULL, NULL, NULL, NULL, cart_ram_write}; |
1142
5c8b1c33ca10
Invalidate translated code on a cartridge bank change in SMS mode. Fix handling of bank 0
Michael Pavone <pavone@retrodev.com>
parents:
1141
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302 memory_map[4] = (memmap_chunk){0xC000, 0xFFFC, sizeof(sms->ram)-1, 0, 0, MMAP_READ|MMAP_WRITE|MMAP_CODE, sms->ram, NULL, NULL, NULL, NULL}; |
1162
c4ea535cf57e
Forgot that the expansion to 32-bit values for 16-bit addresses is not done when calling a C function to handle a memory operation. Mask on location in mapper_write was needed afterall
Michael Pavone <pavone@retrodev.com>
parents:
1154
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303 memory_map[5] = (memmap_chunk){0xFFFC, 0x10000, 0x0003, 0, 0, MMAP_READ, ram_reg_overlap, NULL, NULL, NULL, mapper_write}; |
1141
7e199bebde2f
Initial support for Sega's family of SMS mappers
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parents:
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304 } else { |
7e199bebde2f
Initial support for Sega's family of SMS mappers
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parents:
1130
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305 info_out->map_chunks = 2; |
1201
aee2177a1630
Use filename for game title in SMS mode
Michael Pavone <pavone@retrodev.com>
parents:
1184
diff
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306 memory_map[0] = (memmap_chunk){0x0000, 0xC000, rom_size-1, 0, 0, MMAP_READ, media->buffer, NULL, NULL, NULL, NULL}; |
1141
7e199bebde2f
Initial support for Sega's family of SMS mappers
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parents:
1130
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307 memory_map[1] = (memmap_chunk){0xC000, 0x10000, sizeof(sms->ram)-1, 0, 0, MMAP_READ|MMAP_WRITE|MMAP_CODE, sms->ram, NULL, NULL, NULL, NULL}; |
1117
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
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308 }; |
1141
7e199bebde2f
Initial support for Sega's family of SMS mappers
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309 info_out->map = malloc(sizeof(memmap_chunk) * info_out->map_chunks); |
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Initial support for Sega's family of SMS mappers
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310 memcpy(info_out->map, memory_map, sizeof(memmap_chunk) * info_out->map_chunks); |
1117
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
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311 z80_options *zopts = malloc(sizeof(z80_options)); |
1141
7e199bebde2f
Initial support for Sega's family of SMS mappers
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parents:
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312 init_z80_opts(zopts, info_out->map, info_out->map_chunks, io_map, 4, 15, 0xFF); |
1130
8f14767661fa
Remove memory map assumptions from Z80 core and move a little bit of logic to the generic backend.c so it can be shared between CPU cores
Michael Pavone <pavone@retrodev.com>
parents:
1129
diff
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313 sms->z80 = init_z80_context(zopts); |
1117
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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314 sms->z80->system = sms; |
1149
6b0da6021544
Don't lock up CPU if performing a read with writes configured when in PBC mode. Allow access to VDP debug commands from Z80 debugger in PBC mode. Handle Mode 4 in VDP debug print functions
Michael Pavone <pavone@retrodev.com>
parents:
1148
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|
315 sms->z80->options->gen.debug_cmd_handler = debug_commands; |
1117
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
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|
316 |
1201
aee2177a1630
Use filename for game title in SMS mode
Michael Pavone <pavone@retrodev.com>
parents:
1184
diff
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|
317 sms->rom = media->buffer; |
1141
7e199bebde2f
Initial support for Sega's family of SMS mappers
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318 sms->rom_size = rom_size; |
7e199bebde2f
Initial support for Sega's family of SMS mappers
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319 if (info_out->map_chunks > 2) { |
7e199bebde2f
Initial support for Sega's family of SMS mappers
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320 sms->z80->mem_pointers[0] = sms->rom; |
7e199bebde2f
Initial support for Sega's family of SMS mappers
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321 sms->z80->mem_pointers[1] = sms->rom + 0x4000; |
7e199bebde2f
Initial support for Sega's family of SMS mappers
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322 sms->z80->mem_pointers[2] = sms->rom + 0x8000; |
1162
c4ea535cf57e
Forgot that the expansion to 32-bit values for 16-bit addresses is not done when calling a C function to handle a memory operation. Mask on location in mapper_write was needed afterall
Michael Pavone <pavone@retrodev.com>
parents:
1154
diff
changeset
|
323 sms->bank_regs[1] = 0; |
c4ea535cf57e
Forgot that the expansion to 32-bit values for 16-bit addresses is not done when calling a C function to handle a memory operation. Mask on location in mapper_write was needed afterall
Michael Pavone <pavone@retrodev.com>
parents:
1154
diff
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|
324 sms->bank_regs[2] = 0x4000 >> 14; |
c4ea535cf57e
Forgot that the expansion to 32-bit values for 16-bit addresses is not done when calling a C function to handle a memory operation. Mask on location in mapper_write was needed afterall
Michael Pavone <pavone@retrodev.com>
parents:
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|
325 sms->bank_regs[3] = 0x8000 >> 14; |
1141
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Initial support for Sega's family of SMS mappers
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parents:
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|
326 } |
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Initial support for Sega's family of SMS mappers
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|
327 |
1326
071e761bcdcf
Fix a deficiency in the way types were handled in my ternary tree. Fixes in which some paths that were constructed from a template with variables would sometimes get an extra garbage character thrown in
Michael Pavone <pavone@retrodev.com>
parents:
1209
diff
changeset
|
328 char * lowpass_cutoff_str = tern_find_path(config, "audio\0lowpass_cutoff\0", TVAL_PTR).ptrval; |
1117
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
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|
329 uint32_t lowpass_cutoff = lowpass_cutoff_str ? atoi(lowpass_cutoff_str) : 3390; |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
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|
330 |
928a65750345
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331 //TODO: Detect region and pick master clock based off of that |
928a65750345
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|
332 sms->normal_clock = sms->master_clock = 53693175; |
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parents:
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|
333 |
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334 sms->psg = malloc(sizeof(psg_context)); |
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|
335 psg_init(sms->psg, render_sample_rate(), sms->master_clock, 15*16, render_audio_buffer(), lowpass_cutoff); |
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parents:
diff
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|
336 |
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337 sms->vdp = malloc(sizeof(vdp_context)); |
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diff
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338 init_vdp_context(sms->vdp, 0); |
928a65750345
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diff
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|
339 sms->vdp->system = &sms->header; |
928a65750345
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parents:
diff
changeset
|
340 |
928a65750345
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parents:
diff
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|
341 info_out->save_type = SAVE_NONE; |
1201
aee2177a1630
Use filename for game title in SMS mode
Michael Pavone <pavone@retrodev.com>
parents:
1184
diff
changeset
|
342 info_out->name = strdup(media->name); |
1117
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
changeset
|
343 |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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diff
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|
344 setup_io_devices(config, info_out, &sms->io); |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
changeset
|
345 |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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|
346 sms->header.set_speed_percent = set_speed_percent; |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
changeset
|
347 sms->header.start_context = start_sms; |
928a65750345
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parents:
diff
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|
348 sms->header.resume_context = run_sms; |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
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|
349 //TODO: Fill in NULL values |
928a65750345
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parents:
diff
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|
350 sms->header.load_save = NULL; |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
changeset
|
351 sms->header.persist_save = NULL; |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
changeset
|
352 sms->header.free_context = free_sms; |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
changeset
|
353 sms->header.get_open_bus_value = get_open_bus_value; |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
354 sms->header.request_exit = request_exit; |
1209
5ee6b6345ea9
Implement SMS hardware soft reset (note only available on real hardware on the Genesis in PBC mode)
Michael Pavone <pavone@retrodev.com>
parents:
1201
diff
changeset
|
355 sms->header.soft_reset = soft_reset; |
1120
e9369d6f0101
Somewhat broken implementation of Mode 4
Michael Pavone <pavone@retrodev.com>
parents:
1119
diff
changeset
|
356 sms->header.inc_debug_mode = inc_debug_mode; |
e9369d6f0101
Somewhat broken implementation of Mode 4
Michael Pavone <pavone@retrodev.com>
parents:
1119
diff
changeset
|
357 sms->header.inc_debug_pal = inc_debug_pal; |
1117
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
changeset
|
358 |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
changeset
|
359 return sms; |
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff
changeset
|
360 } |