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annotate notes.txt @ 1374:8f404b1fa572

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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 0ae589d4c3f9
children
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1 cmp.w <ea>, Dn 4(1/0) + <ea> time
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2 cmp.l <ea>, Dn 6(1/0) + <ea> time
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3 cmp.w #num, Dn 4(1/0) + 4(1/0)
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4 cmp.l #num, Dn 6(1/0) + 8(2/0)
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5
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6 cmpi.w #num, Dn 8(2/0)
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7 cmpi.l #num, Dn 14(3/0)
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8
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9
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10 movem
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12 subtype field (bits 9-11) = 110 or 100 depending on direction
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13 bit 8 = 0
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14 bit 7 = 1
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15 bit 6 = size
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19 x86-64 registers in 68K core
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21 1. native stack pointer
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22 2. current cycle count
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23 3. target cycle count
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24 4. cartridge address
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25 5. work ram address
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26 6. scratch register
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27 7. context pointer (contains 68K registers and memory pointers not in registers)
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28 8. status register (maybe, depends on how well I can abuse native x86 status stuff)
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29 Rest of registers used for holding 68K registers
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31 rax = cycle counter
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32 bl = N flag
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33 bh = V flag
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34 rcx = scratch register
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35 dl = Z flag
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36 dh = C flag
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37 rbp = target cycle count
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38 rsi = context pointer
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39 rdi = scratch register
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40 r8 = cartridge address
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41 r9 = work ram address
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42 r10 = d0
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43 r11 = d1
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44 r12 = d2
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45 r13 = a0
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46 r14 = a1
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47 r15 = a7
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48 rsp = native stack pointer
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49
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50 68K context:
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51 uint8_t flags[5];
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52 uint8_t pad??[3]
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53 uint32_t dregs[8]; //8 + 4 * reg
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54 uint32_t aregs[8]; //40 + 4 * reg
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55 .....
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56
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57 x86-64 registers in Z80 core
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58
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59 ax = HL
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60 bx = BC
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61 cx = DE
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62 dx = IX
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63 ebp = current cycle count
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64 rsi = context pointer
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65 edi = target cycle count
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66 rsp = native stack pointer
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67 r8 = IY
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68 r9 = SP
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69 r10 = A (maybe AF?)
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70 r11 = z80 ram address
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71 r12 = cartridge address if bank is pointed at ROM
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72 r13 = scratch1
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73 r14 = scratch2
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74 r15 = ?maybe z80 bank register?
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