| 1 | #include "pico_int.h" |
| 2 | #include "sound/sn76496.h" |
| 3 | |
| 4 | static unsigned char vdp_data_read(void) |
| 5 | { |
| 6 | struct PicoVideo *pv = &Pico.video; |
| 7 | unsigned char d; |
| 8 | |
| 9 | d = Pico.vramb[pv->addr]; |
| 10 | pv->addr = (pv->addr + 1) & 0x3fff; |
| 11 | pv->pending = 0; |
| 12 | return d; |
| 13 | } |
| 14 | |
| 15 | static unsigned char vdp_ctl_read(void) |
| 16 | { |
| 17 | unsigned char d = Pico.video.pending_ints << 7; |
| 18 | Pico.video.pending = 0; |
| 19 | Pico.video.pending_ints = 0; |
| 20 | |
| 21 | elprintf(EL_SR, "VDP sr: %02x", d); |
| 22 | return d; |
| 23 | } |
| 24 | |
| 25 | static void vdp_data_write(unsigned char d) |
| 26 | { |
| 27 | struct PicoVideo *pv = &Pico.video; |
| 28 | |
| 29 | if (pv->type == 3) { |
| 30 | Pico.cram[pv->addr & 0x1f] = d; |
| 31 | } else { |
| 32 | Pico.vramb[pv->addr] = d; |
| 33 | } |
| 34 | pv->addr = (pv->addr + 1) & 0x3fff; |
| 35 | elprintf(EL_ANOMALY, " addr=%04x", pv->addr); |
| 36 | |
| 37 | pv->pending = 0; |
| 38 | } |
| 39 | |
| 40 | static void vdp_ctl_write(unsigned char d) |
| 41 | { |
| 42 | struct PicoVideo *pv = &Pico.video; |
| 43 | |
| 44 | if (pv->pending) { |
| 45 | if ((d >> 6) == 2) { |
| 46 | pv->reg[d & 0x0f] = pv->addr; |
| 47 | elprintf(EL_ANOMALY, " VDP r%02x=%02x", d & 0x0f, pv->addr & 0xff); |
| 48 | } |
| 49 | pv->type = d >> 6; |
| 50 | pv->addr &= 0x00ff; |
| 51 | pv->addr |= (d & 0x3f) << 8; |
| 52 | } else { |
| 53 | pv->addr &= 0x3f00; |
| 54 | pv->addr |= d; |
| 55 | } |
| 56 | pv->pending ^= 1; |
| 57 | } |
| 58 | |
| 59 | static unsigned char z80_sms_in(unsigned short a) |
| 60 | { |
| 61 | unsigned char d = 0; |
| 62 | |
| 63 | elprintf(EL_ANOMALY, "z80 port %04x read", a); |
| 64 | a &= 0xc1; |
| 65 | switch (a) |
| 66 | { |
| 67 | case 0x00: |
| 68 | case 0x01: |
| 69 | d = 0xff; |
| 70 | break; |
| 71 | |
| 72 | case 0x40: /* V counter */ |
| 73 | d = Pico.video.v_counter; |
| 74 | break; |
| 75 | |
| 76 | case 0x41: /* H counter */ |
| 77 | d = Pico.m.rotate++; |
| 78 | break; |
| 79 | |
| 80 | case 0x80: |
| 81 | d = vdp_data_read(); |
| 82 | break; |
| 83 | |
| 84 | case 0x81: |
| 85 | d = vdp_ctl_read(); |
| 86 | break; |
| 87 | |
| 88 | case 0xc0: /* I/O port A and B */ |
| 89 | d = ~((PicoPad[0] & 0x3f) | (PicoPad[1] << 6)); |
| 90 | break; |
| 91 | |
| 92 | case 0xc1: /* I/O port B and miscellaneous */ |
| 93 | d = (Pico.sms_io_ctl & 0x80) | ((Pico.sms_io_ctl << 1) & 0x40) | 0x30; |
| 94 | d |= ~(PicoPad[1] >> 2) & 0x0f; |
| 95 | break; |
| 96 | } |
| 97 | |
| 98 | elprintf(EL_ANOMALY, "ret = %02x", d); |
| 99 | return d; |
| 100 | } |
| 101 | |
| 102 | static void z80_sms_out(unsigned short a, unsigned char d) |
| 103 | { |
| 104 | elprintf(EL_ANOMALY, "z80 port %04x write %02x", a, d); |
| 105 | a &= 0xc1; |
| 106 | switch (a) |
| 107 | { |
| 108 | case 0x01: |
| 109 | Pico.sms_io_ctl = d; |
| 110 | break; |
| 111 | |
| 112 | case 0x40: |
| 113 | case 0x41: |
| 114 | if (PicoOpt & POPT_EN_PSG) |
| 115 | SN76496Write(d); |
| 116 | break; |
| 117 | |
| 118 | case 0x80: |
| 119 | vdp_data_write(d); |
| 120 | break; |
| 121 | |
| 122 | case 0x81: |
| 123 | vdp_ctl_write(d); |
| 124 | break; |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | static void write_bank(unsigned short a, unsigned char d) |
| 129 | { |
| 130 | d &= 0x3f; // XXX |
| 131 | switch (a & 0x0f) |
| 132 | { |
| 133 | case 0x0c: |
| 134 | break; |
| 135 | case 0x0d: |
| 136 | if (d != 0) |
| 137 | elprintf(EL_STATUS|EL_ANOMALY, "bank0 changed to %d!", d); |
| 138 | break; |
| 139 | case 0x0e: |
| 140 | z80_map_set(z80_read_map, 0x4000, 0x7fff, Pico.rom + (d << 14), 0); |
| 141 | #ifdef _USE_CZ80 |
| 142 | Cz80_Set_Fetch(&CZ80, 0x4000, 0x7fff, (UINT32)Pico.rom + (d << 14)); |
| 143 | #endif |
| 144 | break; |
| 145 | case 0x0f: |
| 146 | z80_map_set(z80_read_map, 0x8000, 0xbfff, Pico.rom + (d << 14), 0); |
| 147 | #ifdef _USE_CZ80 |
| 148 | Cz80_Set_Fetch(&CZ80, 0x8000, 0xbfff, (UINT32)Pico.rom + (d << 14)); |
| 149 | #endif |
| 150 | break; |
| 151 | } |
| 152 | } |
| 153 | |
| 154 | static unsigned char MEMH_FUNC xread(unsigned short a) |
| 155 | { |
| 156 | elprintf(EL_ANOMALY, "z80 read [%04x]", a); |
| 157 | return Pico.zram[a & 0x1fff]; |
| 158 | } |
| 159 | |
| 160 | static void MEMH_FUNC xwrite(unsigned int a, unsigned char d) |
| 161 | { |
| 162 | elprintf(EL_ANOMALY, "z80 write [%04x] %02x", a, d); |
| 163 | if (a >= 0xc000) |
| 164 | Pico.zram[a & 0x1fff] = d; |
| 165 | if (a >= 0xfff0) |
| 166 | write_bank(a, d); |
| 167 | } |
| 168 | |
| 169 | void PicoResetMS(void) |
| 170 | { |
| 171 | z80_reset(); |
| 172 | PsndReset(); // pal must be known here |
| 173 | } |
| 174 | |
| 175 | void PicoPowerMS(void) |
| 176 | { |
| 177 | memset(&Pico.ram,0,(unsigned int)&Pico.rom-(unsigned int)&Pico.ram); |
| 178 | memset(&Pico.video,0,sizeof(Pico.video)); |
| 179 | memset(&Pico.m,0,sizeof(Pico.m)); |
| 180 | Pico.m.pal = 0; |
| 181 | |
| 182 | PicoReset(); |
| 183 | } |
| 184 | |
| 185 | void PicoMemSetupMS(void) |
| 186 | { |
| 187 | z80_map_set(z80_read_map, 0x0000, 0xbfff, Pico.rom, 0); |
| 188 | z80_map_set(z80_read_map, 0xc000, 0xdfff, Pico.zram, 0); |
| 189 | z80_map_set(z80_read_map, 0xe000, 0xffff, xread, 1); |
| 190 | |
| 191 | z80_map_set(z80_write_map, 0x0000, 0xbfff, xwrite, 1); |
| 192 | z80_map_set(z80_write_map, 0xc000, 0xdfff, Pico.zram, 0); |
| 193 | z80_map_set(z80_write_map, 0xe000, 0xffff, xwrite, 1); |
| 194 | |
| 195 | #ifdef _USE_DRZ80 |
| 196 | drZ80.z80_in = z80_sms_in; |
| 197 | drZ80.z80_out = z80_sms_out; |
| 198 | #endif |
| 199 | #ifdef _USE_CZ80 |
| 200 | Cz80_Set_Fetch(&CZ80, 0x0000, 0xbfff, (UINT32)Pico.rom); |
| 201 | Cz80_Set_Fetch(&CZ80, 0xc000, 0xdfff, (UINT32)Pico.zram); |
| 202 | Cz80_Set_Fetch(&CZ80, 0xe000, 0xffff, (UINT32)Pico.zram); |
| 203 | Cz80_Set_INPort(&CZ80, z80_sms_in); |
| 204 | Cz80_Set_OUTPort(&CZ80, z80_sms_out); |
| 205 | #endif |
| 206 | } |
| 207 | |
| 208 | void PicoFrameMS(void) |
| 209 | { |
| 210 | struct PicoVideo *pv = &Pico.video; |
| 211 | int is_pal = Pico.m.pal; |
| 212 | int lines = is_pal ? 313 : 262; |
| 213 | int cycles_line = is_pal ? 58020 : 58293; /* (226.6 : 227.7) * 256 */ |
| 214 | int cycles_done = 0, cycles_aim = 0; |
| 215 | int lines_vis = 192; |
| 216 | int y; |
| 217 | |
| 218 | for (y = 0; y < lines; y++) |
| 219 | { |
| 220 | pv->v_counter = Pico.m.scanline = y; |
| 221 | |
| 222 | if (y == lines_vis + 1) { |
| 223 | Pico.video.pending_ints |= 1; |
| 224 | if (Pico.video.reg[1] & 0x20) { |
| 225 | elprintf(EL_INTS, "vint"); |
| 226 | z80_int(); |
| 227 | } |
| 228 | } |
| 229 | |
| 230 | cycles_aim += cycles_line; |
| 231 | cycles_done += z80_run((cycles_aim - cycles_done) >> 8) << 8; |
| 232 | } |
| 233 | |
| 234 | PsndGetSamplesMS(); |
| 235 | elprintf(EL_ANOMALY, "frame end"); |
| 236 | } |
| 237 | |