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- /*
- * PicoDrive
- * (C) notaz, 2008
- *
- * This work is licensed under the terms of MAME license.
- * See COPYING file in the top-level directory.
- */
- #include "../pico_int.h"
- #include "../memory.h"
- #include "../sound/sn76496.h"
- /*
- void dump(u16 w)
- {
- static FILE *f[0x10] = { NULL, };
- char fname[32];
- int num = PicoPicohw.r12 & 0xf;
- w = (w << 8) | (w >> 8);
- sprintf(fname, "ldump%i.bin", num);
- if (f[num] == NULL)
- f[num] = fopen(fname, "wb");
- fwrite(&w, 1, 2, f[num]);
- //fclose(f);
- }
- */
- static u32 PicoRead8_pico(u32 a)
- {
- u32 d = 0;
- if ((a & 0xffffe0) == 0x800000) // Pico I/O
- {
- switch (a & 0x1f)
- {
- case 0x01: d = PicoPicohw.r1; break;
- case 0x03:
- d = PicoPad[0]&0x1f; // d-pad
- d |= (PicoPad[0]&0x20) << 2; // pen push -> C
- d = ~d;
- break;
- case 0x05: d = (PicoPicohw.pen_pos[0] >> 8); break; // what is MS bit for? Games read it..
- case 0x07: d = PicoPicohw.pen_pos[0] & 0xff; break;
- case 0x09: d = (PicoPicohw.pen_pos[1] >> 8); break;
- case 0x0b: d = PicoPicohw.pen_pos[1] & 0xff; break;
- case 0x0d: d = (1 << (PicoPicohw.page & 7)) - 1; break;
- case 0x12: d = PicoPicohw.fifo_bytes == 0 ? 0x80 : 0; break; // guess
- default:
- goto unhandled;
- }
- return d;
- }
- unhandled:
- elprintf(EL_UIO, "m68k unmapped r8 [%06x] @%06x", a, SekPc);
- return d;
- }
- static u32 PicoRead16_pico(u32 a)
- {
- u32 d = 0;
- if (a == 0x800010)
- d = (PicoPicohw.fifo_bytes > 0x3f) ? 0 : (0x3f - PicoPicohw.fifo_bytes);
- else if (a == 0x800012)
- d = PicoPicohw.fifo_bytes == 0 ? 0x8000 : 0; // guess
- else
- elprintf(EL_UIO, "m68k unmapped r16 [%06x] @%06x", a, SekPc);
- return d;
- }
- static void PicoWrite8_pico(u32 a, u32 d)
- {
- switch (a & ~0x800000) {
- case 0x19: case 0x1b: case 0x1d: case 0x1f: break; // 'S' 'E' 'G' 'A'
- default:
- elprintf(EL_UIO, "m68k unmapped w8 [%06x] %02x @%06x", a, d & 0xff, SekPc);
- break;
- }
- }
- static void PicoWrite16_pico(u32 a, u32 d)
- {
- //if (a == 0x800010) dump(d);
- if (a == 0x800010)
- {
- PicoPicohw.fifo_bytes += 2;
- if (PicoPicohw.xpcm_ptr < PicoPicohw.xpcm_buffer + XPCM_BUFFER_SIZE) {
- *PicoPicohw.xpcm_ptr++ = d >> 8;
- *PicoPicohw.xpcm_ptr++ = d;
- }
- else if (PicoPicohw.xpcm_ptr == PicoPicohw.xpcm_buffer + XPCM_BUFFER_SIZE) {
- elprintf(EL_ANOMALY|EL_PICOHW, "xpcm_buffer overflow!");
- PicoPicohw.xpcm_ptr++;
- }
- }
- else if (a == 0x800012) {
- int r12_old = PicoPicohw.r12;
- PicoPicohw.r12 = d;
- if (r12_old != d)
- PicoReratePico();
- }
- else
- elprintf(EL_UIO, "m68k unmapped w16 [%06x] %04x @%06x", a, d & 0xffff, SekPc);
- }
- PICO_INTERNAL void PicoMemSetupPico(void)
- {
- PicoMemSetup();
- // no MD IO or Z80 on Pico
- m68k_map_unmap(0x400000, 0xbfffff);
- // map Pico I/O
- cpu68k_map_set(m68k_read8_map, 0x800000, 0x80ffff, PicoRead8_pico, 1);
- cpu68k_map_set(m68k_read16_map, 0x800000, 0x80ffff, PicoRead16_pico, 1);
- cpu68k_map_set(m68k_write8_map, 0x800000, 0x80ffff, PicoWrite8_pico, 1);
- cpu68k_map_set(m68k_write16_map, 0x800000, 0x80ffff, PicoWrite16_pico, 1);
- }
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