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1 | #include "../pico_int.h" |
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2 | #include "../memory.h" |
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3 | #include "../sound/sn76496.h" |
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4 | |
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5 | /* |
6 | void dump(u16 w) |
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7 | { |
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8 | static FILE *f[0x10] = { NULL, }; |
9 | char fname[32]; |
10 | int num = PicoPicohw.r12 & 0xf; |
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11 | |
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12 | w = (w << 8) | (w >> 8); |
13 | sprintf(fname, "ldump%i.bin", num); |
14 | if (f[num] == NULL) |
15 | f[num] = fopen(fname, "wb"); |
16 | fwrite(&w, 1, 2, f[num]); |
17 | //fclose(f); |
18 | } |
19 | */ |
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20 | |
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21 | static u32 PicoRead8_pico(u32 a) |
22 | { |
23 | u32 d = 0; |
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24 | |
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25 | if ((a & 0xffffe0) == 0x800000) // Pico I/O |
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26 | { |
27 | switch (a & 0x1f) |
28 | { |
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29 | case 0x01: d = PicoPicohw.r1; break; |
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30 | case 0x03: |
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31 | d = PicoPad[0]&0x1f; // d-pad |
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32 | d |= (PicoPad[0]&0x20) << 2; // pen push -> C |
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33 | d = ~d; |
34 | break; |
35 | |
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36 | case 0x05: d = (PicoPicohw.pen_pos[0] >> 8); break; // what is MS bit for? Games read it.. |
37 | case 0x07: d = PicoPicohw.pen_pos[0] & 0xff; break; |
38 | case 0x09: d = (PicoPicohw.pen_pos[1] >> 8); break; |
39 | case 0x0b: d = PicoPicohw.pen_pos[1] & 0xff; break; |
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40 | case 0x0d: d = (1 << (PicoPicohw.page & 7)) - 1; break; |
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41 | case 0x12: d = PicoPicohw.fifo_bytes == 0 ? 0x80 : 0; break; // guess |
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42 | default: |
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43 | goto unhandled; |
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44 | } |
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45 | return d; |
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46 | } |
47 | |
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48 | unhandled: |
49 | elprintf(EL_UIO, "m68k unmapped r8 [%06x] @%06x", a, SekPc); |
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50 | return d; |
51 | } |
52 | |
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53 | static u32 PicoRead16_pico(u32 a) |
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54 | { |
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55 | u32 d = 0; |
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56 | |
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57 | if (a == 0x800010) |
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58 | d = (PicoPicohw.fifo_bytes > 0x3f) ? 0 : (0x3f - PicoPicohw.fifo_bytes); |
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59 | else if (a == 0x800012) |
60 | d = PicoPicohw.fifo_bytes == 0 ? 0x8000 : 0; // guess |
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61 | else |
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62 | elprintf(EL_UIO, "m68k unmapped r16 [%06x] @%06x", a, SekPc); |
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63 | |
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64 | return d; |
65 | } |
66 | |
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67 | static void PicoWrite8_pico(u32 a, u32 d) |
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68 | { |
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69 | switch (a & ~0x800000) { |
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70 | case 0x19: case 0x1b: case 0x1d: case 0x1f: break; // 'S' 'E' 'G' 'A' |
71 | default: |
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72 | elprintf(EL_UIO, "m68k unmapped w8 [%06x] %02x @%06x", a, d & 0xff, SekPc); |
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73 | break; |
74 | } |
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75 | } |
76 | |
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77 | static void PicoWrite16_pico(u32 a, u32 d) |
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78 | { |
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79 | //if (a == 0x800010) dump(d); |
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80 | if (a == 0x800010) |
81 | { |
82 | PicoPicohw.fifo_bytes += 2; |
83 | |
84 | if (PicoPicohw.xpcm_ptr < PicoPicohw.xpcm_buffer + XPCM_BUFFER_SIZE) { |
85 | *PicoPicohw.xpcm_ptr++ = d >> 8; |
86 | *PicoPicohw.xpcm_ptr++ = d; |
87 | } |
88 | else if (PicoPicohw.xpcm_ptr == PicoPicohw.xpcm_buffer + XPCM_BUFFER_SIZE) { |
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89 | elprintf(EL_ANOMALY|EL_PICOHW, "xpcm_buffer overflow!"); |
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90 | PicoPicohw.xpcm_ptr++; |
91 | } |
92 | } |
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93 | else if (a == 0x800012) { |
94 | int r12_old = PicoPicohw.r12; |
95 | PicoPicohw.r12 = d; |
96 | if (r12_old != d) |
97 | PicoReratePico(); |
98 | } |
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99 | else |
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100 | elprintf(EL_UIO, "m68k unmapped w16 [%06x] %04x @%06x", a, d & 0xffff, SekPc); |
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101 | } |
102 | |
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103 | |
104 | PICO_INTERNAL void PicoMemSetupPico(void) |
105 | { |
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106 | PicoMemSetup(); |
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107 | |
108 | // no MD IO or Z80 on Pico |
109 | m68k_map_unmap(0x400000, 0xbfffff); |
110 | |
111 | // map Pico I/O |
112 | cpu68k_map_set(m68k_read8_map, 0x800000, 0x80ffff, PicoRead8_pico, 1); |
113 | cpu68k_map_set(m68k_read16_map, 0x800000, 0x80ffff, PicoRead16_pico, 1); |
114 | cpu68k_map_set(m68k_write8_map, 0x800000, 0x80ffff, PicoWrite8_pico, 1); |
115 | cpu68k_map_set(m68k_write16_map, 0x800000, 0x80ffff, PicoWrite16_pico, 1); |
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116 | } |
117 | |