Mercurial > repos > blastem
annotate fake_cpm.sz8 @ 1925:039553703c20
Don't apply address and cd register changes to the 'live' registers until pending flag is cleared, but do preserve the upper address bits in the latch. Fixes regression in Overdrive 2 while preserving fix to Mona in 344 bytes
author | Michael Pavone <pavone@retrodev.com> |
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date | Mon, 13 Apr 2020 20:43:25 -0700 |
parents | cf6149b7c6e5 |
children |
rev | line source |
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820
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
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changeset
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1 CONSOLE_PORT equ 0 |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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2 STATUS_PORT equ 1 |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
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changeset
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3 EXIT_PORT equ 2 |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
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changeset
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4 org $E400 |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
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5 jp handle_call |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
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6 ld a, (should_exit) |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
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changeset
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7 dec a |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
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changeset
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8 jr z, do_exit |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
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9 ld a, 1 |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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10 ld (should_exit), a |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
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11 jp $100 |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
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12 do_exit: |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
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13 no_impl |
cf6149b7c6e5
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parents:
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14 out (EXIT_PORT), a |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
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15 should_exit: |
cf6149b7c6e5
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Michael Pavone <pavone@retrodev.com>
parents:
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16 dc.b 0 |
cf6149b7c6e5
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parents:
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17 |
cf6149b7c6e5
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parents:
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18 console_in: |
cf6149b7c6e5
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parents:
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19 in a, (CONSOLE_PORT) |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
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20 ld l, a |
cf6149b7c6e5
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parents:
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21 ret |
cf6149b7c6e5
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Michael Pavone <pavone@retrodev.com>
parents:
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22 console_out: |
cf6149b7c6e5
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Michael Pavone <pavone@retrodev.com>
parents:
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23 ld a, e |
cf6149b7c6e5
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parents:
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changeset
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24 out (CONSOLE_PORT), a |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
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25 ret |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
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26 get_iobyte: |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
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27 ld a, (3) |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
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28 ld l, a |
cf6149b7c6e5
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Michael Pavone <pavone@retrodev.com>
parents:
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29 ret |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
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30 set_iobyte: |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
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31 ld a, e |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
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parents:
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32 ld (3), a |
cf6149b7c6e5
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parents:
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33 ret |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
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34 write_string: |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
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parents:
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35 ld c, '$' |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
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parents:
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36 jp .start |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
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37 .continue |
cf6149b7c6e5
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Michael Pavone <pavone@retrodev.com>
parents:
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38 out (CONSOLE_PORT), a |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
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changeset
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39 inc de |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
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40 .start |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
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41 ld a, (de) |
cf6149b7c6e5
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Michael Pavone <pavone@retrodev.com>
parents:
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42 cp c |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
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43 jr nz, .continue |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
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44 ;flush output |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
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45 out (STATUS_PORT),a |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
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46 ret |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
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47 read_string: |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
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48 ld a, (de) |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
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49 ld c, a |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
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50 ld b, $A ;newline |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
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51 inc c |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
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52 inc de |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
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53 push de |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
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54 inc de |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
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55 jp .start |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
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56 .continue |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
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57 in a, (CONSOLE_PORT) |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
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58 cp b |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
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59 jr z, .end |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
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60 ld (de), a |
cf6149b7c6e5
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parents:
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61 inc de |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
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62 .start |
cf6149b7c6e5
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Michael Pavone <pavone@retrodev.com>
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63 dec c |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
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64 jr nz, .continue |
cf6149b7c6e5
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65 ;todo: consume excess characters |
cf6149b7c6e5
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66 .end |
cf6149b7c6e5
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67 pop hl |
cf6149b7c6e5
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68 ex de, hl |
cf6149b7c6e5
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69 sbc hl, de |
cf6149b7c6e5
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70 ld a, l |
cf6149b7c6e5
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71 ld (de), a |
cf6149b7c6e5
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72 ret |
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73 |
cf6149b7c6e5
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74 console_status: |
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75 in a, (STATUS_PORT) |
cf6149b7c6e5
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Michael Pavone <pavone@retrodev.com>
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76 ld l, a |
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77 ret |
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78 |
cf6149b7c6e5
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79 handle_call: |
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80 ld a, c |
cf6149b7c6e5
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81 or a |
cf6149b7c6e5
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82 jr z, do_exit |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
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83 dec a |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
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84 jr z, console_in |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
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85 dec a |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
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86 jr z, console_out |
cf6149b7c6e5
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Michael Pavone <pavone@retrodev.com>
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87 dec a |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
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88 jr z, no_impl ;aux reader input |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
89 dec a |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
90 jr z, no_impl ;aux punch output |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
91 dec a |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
92 jr z, no_impl ;printer output |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
93 dec a |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
94 jr z, no_impl ;direct console IO |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
95 dec a |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
96 jr z, get_iobyte |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
97 dec a |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
98 jr z, set_iobyte |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
99 dec a |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
100 jr z, write_string |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
101 dec a |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
102 jr z, read_string |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
103 dec a |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
104 jr z, console_status |
cf6149b7c6e5
Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
105 jp no_impl |