1 #include "../PicoInt.h"
2 #include "../sound/sn76496.h"
5 typedef unsigned char u8;
6 typedef unsigned short u16;
7 typedef unsigned int u32;
12 // -----------------------------------------------------------------
13 // Read Rom and read Ram
15 static u32 PicoReadPico8(u32 a)
19 if ((a&0xe00000)==0xe00000) { d = *(u8 *)(Pico.ram+((a^1)&0xffff)); goto end; } // Ram
20 if (a<Pico.romsize) { d = *(u8 *)(Pico.rom+(a^1)); goto end; } // Rom
24 if ((a&0xfffff0)==0xc00000) { // VDP
30 if ((a&0xffffe0)==0x800000) // Pico I/O
34 case 0x01: d = PicoPicohw.r1; break;
36 d = PicoPad[0]&0x1f; // d-pad
37 d |= (PicoPad[0]&0x20) << 2; // red button -> C
41 case 0x05: d = (PicoPicohw.pen_pos[0] >> 8); break; // what is MS bit for? Games read it..
42 case 0x07: d = PicoPicohw.pen_pos[0] & 0xff; break;
43 case 0x09: d = (PicoPicohw.pen_pos[1] >> 8); break;
44 case 0x0b: d = PicoPicohw.pen_pos[1] & 0xff; break;
45 case 0x0d: d = (1 << (PicoPicohw.page & 7)) - 1; break;
46 case 0x12: d = PicoPicohw.fifo_bytes == 0 ? 0x80 : 0; break; // guess
48 elprintf(EL_UIO, "r8 : %06x, %02x @%06x", a&0xffffff, (u8)d, SekPc);
53 // elprintf(EL_UIO, "r8 : %06x, %02x @%06x", a&0xffffff, (u8)d, SekPc);
56 elprintf(EL_IO, "r8 : %06x, %02x @%06x", a&0xffffff, (u8)d, SekPc);
60 static u32 PicoReadPico16(u32 a)
64 if ((a&0xe00000)==0xe00000) { d=*(u16 *)(Pico.ram+(a&0xfffe)); goto end; } // Ram
68 if (a<Pico.romsize) { d = *(u16 *)(Pico.rom+a); goto end; } // Rom
70 if ((a&0xfffff0)==0xc00000) {
76 d = (PicoPicohw.fifo_bytes > 0x3f) ? 0 : (0x3f - PicoPicohw.fifo_bytes);
77 else if (a == 0x800012)
78 d = PicoPicohw.fifo_bytes == 0 ? 0x8000 : 0; // guess
80 elprintf(EL_UIO, "r16: %06x, %04x @%06x", a&0xffffff, d, SekPc);
83 elprintf(EL_IO, "r16: %06x, %04x @%06x", a&0xffffff, d, SekPc);
87 static u32 PicoReadPico32(u32 a)
91 if ((a&0xe00000)==0xe00000) { u16 *pm=(u16 *)(Pico.ram+(a&0xfffe)); d = (pm[0]<<16)|pm[1]; goto end; } // Ram
95 if (a<Pico.romsize) { u16 *pm=(u16 *)(Pico.rom+a); d = (pm[0]<<16)|pm[1]; goto end; } // Rom
97 if ((a&0xfffff0)==0xc00000) {
98 d = (PicoVideoRead(a)<<16)|PicoVideoRead(a+2);
102 elprintf(EL_UIO, "r32: %06x, %08x @%06x", a&0xffffff, d, SekPc);
105 elprintf(EL_IO, "r32: %06x, %08x @%06x", a&0xffffff, d, SekPc);
109 // -----------------------------------------------------------------
114 FILE *f = fopen("dump.bin", "a");
120 static void PicoWritePico8(u32 a,u8 d)
122 elprintf(EL_IO, "w8 : %06x, %02x @%06x", a&0xffffff, d, SekPc);
124 if ((a&0xe00000)==0xe00000) { *(u8 *)(Pico.ram+((a^1)&0xffff))=d; return; } // Ram
127 if ((a&0xfffff9)==0xc00011) { if (PicoOpt&2) SN76496Write(d); return; } // PSG Sound
129 if ((a&0xfffff0)==0xc00000) { // VDP
131 PicoVideoWrite(a,(u16)(d|(d<<8))); // Byte access gets mirrored
135 elprintf(EL_UIO, "w8 : %06x, %02x @%06x", a&0xffffff, d, SekPc);
138 static void PicoWritePico16(u32 a,u16 d)
140 elprintf(EL_IO, "w16: %06x, %04x", a&0xffffff, d);
142 if ((a&0xe00000)==0xe00000) { *(u16 *)(Pico.ram+(a&0xfffe))=d; return; } // Ram
145 if ((a&0xfffff0)==0xc00000) { PicoVideoWrite(a,(u16)d); return; } // VDP
147 // if (a == 0x800010) dump(d);
150 PicoPicohw.fifo_bytes += 2;
152 if (PicoPicohw.xpcm_ptr < PicoPicohw.xpcm_buffer + XPCM_BUFFER_SIZE) {
153 *PicoPicohw.xpcm_ptr++ = d >> 8;
154 *PicoPicohw.xpcm_ptr++ = d;
156 else if (PicoPicohw.xpcm_ptr == PicoPicohw.xpcm_buffer + XPCM_BUFFER_SIZE) {
157 elprintf(EL_ANOMALY, "xpcm_buffer overflow!");
158 PicoPicohw.xpcm_ptr++;
161 else if (a == 0x800012) {
162 int r12_old = PicoPicohw.r12;
168 elprintf(EL_UIO, "w16: %06x, %04x", a&0xffffff, d);
171 static void PicoWritePico32(u32 a,u32 d)
173 elprintf(EL_IO, "w32: %06x, %08x", a&0xffffff, d);
175 if ((a&0xe00000)==0xe00000)
178 u16 *pm=(u16 *)(Pico.ram+(a&0xfffe));
179 pm[0]=(u16)(d>>16); pm[1]=(u16)d;
184 if ((a&0xfffff0)==0xc00000)
187 PicoVideoWrite(a, (u16)(d>>16));
188 PicoVideoWrite(a+2,(u16)d);
192 elprintf(EL_UIO, "w32: %06x, %08x", a&0xffffff, d);
196 extern unsigned int (*pm68k_read_memory_8) (unsigned int address);
197 extern unsigned int (*pm68k_read_memory_16)(unsigned int address);
198 extern unsigned int (*pm68k_read_memory_32)(unsigned int address);
199 extern void (*pm68k_write_memory_8) (unsigned int address, unsigned char value);
200 extern void (*pm68k_write_memory_16)(unsigned int address, unsigned short value);
201 extern void (*pm68k_write_memory_32)(unsigned int address, unsigned int value);
202 extern unsigned int (*pm68k_read_memory_pcr_8) (unsigned int address);
203 extern unsigned int (*pm68k_read_memory_pcr_16)(unsigned int address);
204 extern unsigned int (*pm68k_read_memory_pcr_32)(unsigned int address);
206 static unsigned int m68k_read_memory_pcrp_8(unsigned int a)
208 if((a&0xe00000)==0xe00000) return *(u8 *)(Pico.ram+((a^1)&0xffff)); // Ram
212 static unsigned int m68k_read_memory_pcrp_16(unsigned int a)
214 if((a&0xe00000)==0xe00000) return *(u16 *)(Pico.ram+(a&0xfffe)); // Ram
218 static unsigned int m68k_read_memory_pcrp_32(unsigned int a)
220 if((a&0xe00000)==0xe00000) { u16 *pm=(u16 *)(Pico.ram+(a&0xfffe)); return (pm[0]<<16)|pm[1]; } // Ram
226 PICO_INTERNAL void PicoMemSetupPico(void)
229 PicoCpuCM68k.checkpc=PicoCheckPc;
230 PicoCpuCM68k.fetch8 =PicoCpuCM68k.read8 =PicoReadPico8;
231 PicoCpuCM68k.fetch16=PicoCpuCM68k.read16=PicoReadPico16;
232 PicoCpuCM68k.fetch32=PicoCpuCM68k.read32=PicoReadPico32;
233 PicoCpuCM68k.write8 =PicoWritePico8;
234 PicoCpuCM68k.write16=PicoWritePico16;
235 PicoCpuCM68k.write32=PicoWritePico32;
238 pm68k_read_memory_8 = PicoReadPico8;
239 pm68k_read_memory_16 = PicoReadPico16;
240 pm68k_read_memory_32 = PicoReadPico32;
241 pm68k_write_memory_8 = PicoWritePico8;
242 pm68k_write_memory_16 = PicoWritePico16;
243 pm68k_write_memory_32 = PicoWritePico32;
244 pm68k_read_memory_pcr_8 = m68k_read_memory_pcrp_8;
245 pm68k_read_memory_pcr_16 = m68k_read_memory_pcrp_16;
246 pm68k_read_memory_pcr_32 = m68k_read_memory_pcrp_32;