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- /*
- * SMS emulation
- * (C) notaz, 2009-2010
- *
- * This work is licensed under the terms of MAME license.
- * See COPYING file in the top-level directory.
- */
- /*
- * TODO:
- * - start in a state as if BIOS ran
- * - region support
- * - H counter
- */
- #include "pico_int.h"
- #include "memory.h"
- #include "sound/sn76496.h"
- #include "sound/emu2413/emu2413.h"
- extern void YM2413_regWrite(unsigned reg);
- extern void YM2413_dataWrite(unsigned data);
- static unsigned short ymflag = 0xffff;
- static unsigned char vdp_data_read(void)
- {
- struct PicoVideo *pv = &Pico.video;
- unsigned char d;
- d = PicoMem.vramb[MEM_LE2(pv->addr)];
- pv->addr = (pv->addr + 1) & 0x3fff;
- pv->pending = 0;
- return d;
- }
- static unsigned char vdp_ctl_read(void)
- {
- struct PicoVideo *pv = &Pico.video;
- unsigned char d;
- z80_int_assert(0);
- d = pv->status | (pv->pending_ints << 7);
- pv->pending = pv->pending_ints = 0;
- pv->status = 0;
- elprintf(EL_SR, "VDP sr: %02x", d);
- return d;
- }
- static void vdp_data_write(unsigned char d)
- {
- struct PicoVideo *pv = &Pico.video;
- if (pv->type == 3) {
- if (Pico.m.hardware & 0x1) { // GG, same layout as MD
- unsigned a = pv->addr & 0x3f;
- if (a & 0x1) d &= 0x0f;
- if (((u8 *)PicoMem.cram)[MEM_LE2(a)] != d) Pico.m.dirtyPal = 1;
- ((u8 *)PicoMem.cram)[MEM_LE2(a)] = d;
- } else { // SMS, convert to MD layout (00BbGgRr to 0000BbBbGgGgRrRr)
- unsigned a = pv->addr & 0x1f;
- u16 c = (d&0x30)*0x40 + (d&0x0c)*0x10 + (d&0x03)*0x04;
- if (PicoMem.cram[a] != (c | (c>>2))) Pico.m.dirtyPal = 1;
- PicoMem.cram[a] = c | (c>>2);
- }
- } else {
- PicoMem.vramb[MEM_LE2(pv->addr)] = d;
- }
- pv->addr = (pv->addr + 1) & 0x3fff;
- pv->pending = 0;
- }
- static NOINLINE void vdp_reg_write(struct PicoVideo *pv, u8 a, u8 d)
- {
- int l;
- pv->reg[a] = d;
- switch (a) {
- case 0:
- l = pv->pending_ints & (d >> 3) & 2;
- elprintf(EL_INTS, "hint %d", l);
- z80_int_assert(l);
- break;
- case 1:
- l = pv->pending_ints & (d >> 5) & 1;
- elprintf(EL_INTS, "vint %d", l);
- z80_int_assert(l);
- break;
- }
- }
- static void vdp_ctl_write(u8 d)
- {
- struct PicoVideo *pv = &Pico.video;
- if (pv->pending) {
- if ((d >> 6) == 2) {
- elprintf(EL_IO, " VDP r%02x=%02x", d & 0x0f, pv->addr & 0xff);
- if (pv->reg[d & 0x0f] != (u8)pv->addr)
- vdp_reg_write(pv, d & 0x0f, pv->addr);
- }
- pv->type = d >> 6;
- pv->addr &= 0x00ff;
- pv->addr |= (d & 0x3f) << 8;
- } else {
- pv->addr &= 0x3f00;
- pv->addr |= d;
- }
- pv->pending ^= 1;
- }
- static unsigned char z80_sms_in(unsigned short a)
- {
- unsigned char d = 0;
- elprintf(EL_IO, "z80 port %04x read", a);
- if((a&0xff)>= 0xf0){
- if (PicoIn.opt & POPT_EN_YM2413){
- switch((a&0xff))
- {
- case 0xf0:
- // FM reg port
- break;
- case 0xf1:
- // FM data port
- break;
- case 0xf2:
- // bit 0 = 1 active FM Pac
- d = ymflag;
- //printf("read FM Check = %02x\n", d);
- break;
- }
- }
- }
- else{
- a &= 0xc1;
- switch (a)
- {
- case 0x00:
- case 0x01:
- d = 0xff & ~(PicoIn.pad[0] & 0x80);
- break;
- case 0x40: /* V counter */
- d = Pico.video.v_counter;
- elprintf(EL_HVCNT, "V counter read: %02x", d);
- break;
- case 0x41: /* H counter */
- d = Pico.m.rotate++;
- elprintf(EL_HVCNT, "H counter read: %02x", d);
- break;
- case 0x80:
- d = vdp_data_read();
- break;
- case 0x81:
- d = vdp_ctl_read();
- break;
- case 0xc0: /* I/O port A and B */
- d = ~((PicoIn.pad[0] & 0x3f) | (PicoIn.pad[1] << 6));
- break;
- case 0xc1: /* I/O port B and miscellaneous */
- d = (Pico.ms.io_ctl & 0x80) | ((Pico.ms.io_ctl << 1) & 0x40) | 0x30;
- d |= ~(PicoIn.pad[1] >> 2) & 0x0f;
- break;
- }
- }
- elprintf(EL_IO, "ret = %02x", d);
- return d;
- }
- static void z80_sms_out(unsigned short a, unsigned char d)
- {
- elprintf(EL_IO, "z80 port %04x write %02x", a, d);
- if((a&0xff)>= 0xf0){
- if (PicoIn.opt & POPT_EN_YM2413){
- switch((a&0xff))
- {
- case 0xf0:
- // FM reg port
- YM2413_regWrite(d);
- //printf("write FM register = %02x\n", d);
- break;
- case 0xf1:
- // FM data port
- YM2413_dataWrite(d);
- //printf("write FM data = %02x\n", d);
- break;
- case 0xf2:
- // bit 0 = 1 active FM Pac
- ymflag = d;
- //printf("write FM Check = %02x\n", d);
- break;
- }
- }
- }
- else{
- a &= 0xc1;
- switch (a)
- {
- case 0x01:
- Pico.ms.io_ctl = d;
- break;
- case 0x40:
- case 0x41:
- PsndDoPSG(z80_cyclesDone());
- SN76496Write(d);
- break;
- case 0x80:
- vdp_data_write(d);
- break;
- case 0x81:
- vdp_ctl_write(d);
- break;
- }
- }
- }
- static int bank_mask;
- static void xwrite(unsigned int a, unsigned char d);
- static void write_sram(unsigned short a, unsigned char d)
- {
- // SRAM is mapped in 2 16KB banks, selected by bit 2 in control reg
- a &= 0x3fff;
- a += ((Pico.ms.carthw[0x0c] & 0x04) >> 2) * 0x4000;
- Pico.sv.changed |= (Pico.sv.data[a] != d);
- Pico.sv.data[a] = d;
- }
- // 16KB bank mapping for Sega mapper
- static void write_bank_sega(unsigned short a, unsigned char d)
- {
- elprintf(EL_Z80BNK, "bank %04x %02x @ %04x", a, d, z80_pc());
- Pico.ms.carthw[a & 0x0f] = d;
- switch (a & 0x0f)
- {
- case 0x0d:
- d &= bank_mask;
- z80_map_set(z80_read_map, 0x0400, 0x3fff, Pico.rom+0x400 + (d << 14), 0);
- break;
- case 0x0e:
- d &= bank_mask;
- z80_map_set(z80_read_map, 0x4000, 0x7fff, Pico.rom + (d << 14), 0);
- break;
- case 0x0c:
- if (d & ~0x8c)
- elprintf(EL_STATUS|EL_ANOMALY, "%02x written to control reg!", d);
- /*FALLTHROUGH*/
- case 0x0f:
- if (Pico.ms.carthw[0xc] & 0x08) {
- d = (Pico.ms.carthw[0xc] & 0x04) >> 2;
- z80_map_set(z80_read_map, 0x8000, 0xbfff, Pico.sv.data + d*0x4000, 0);
- z80_map_set(z80_write_map, 0x8000, 0xbfff, write_sram, 1);
- } else {
- d = Pico.ms.carthw[0xf] & bank_mask;
- z80_map_set(z80_read_map, 0x8000, 0xbfff, Pico.rom + (d << 14), 0);
- z80_map_set(z80_write_map, 0x8000, 0xbfff, xwrite, 1);
- }
- break;
- }
- }
- // 8KB ROM mapping for MSX mapper
- static void write_bank_msx(unsigned short a, unsigned char d)
- {
- Pico.ms.mapper = 1; // TODO define (more) mapper types
- Pico.ms.carthw[a] = d;
- a = (a^2)*0x2000 + 0x4000;
- d &= 2*bank_mask + 1;
- z80_map_set(z80_read_map, a, a+0x1fff, Pico.rom + (d << 13), 0);
- }
- // TODO mapping is currently auto-selecting, but that's not very reliable.
- static void xwrite(unsigned int a, unsigned char d)
- {
- elprintf(EL_IO, "z80 write [%04x] %02x", a, d);
- if (a >= 0xc000)
- PicoMem.zram[a & 0x1fff] = d;
- // Sega. Maps 4 bank 16KB each
- if (a >= 0xfff8 /*&& !Pico.ms.mapper*/)
- write_bank_sega(a, d);
- // Codemasters. Similar to Sega, but different addresses
- if (a == 0x0000 && !Pico.ms.mapper)
- write_bank_sega(0xfffd, d);
- if (a == 0x4000)
- write_bank_sega(0xfffe, d);
- if (a == 0x8000)
- write_bank_sega(0xffff, d);
- // Korean. 1 selectable 16KB bank at the top
- if (a == 0xa000)
- write_bank_sega(0xffff, d);
- // MSX. 4 selectable 8KB banks at the top
- if (a <= 0x0003 && (a || Pico.ms.mapper))
- write_bank_msx(a, d);
- }
- void PicoResetMS(void)
- {
- z80_reset();
- PsndReset(); // pal must be known here
- ymflag = 0xffff;
- Pico.m.dirtyPal = 1;
- // reset memory mapping
- PicoMemSetupMS();
- }
- void PicoPowerMS(void)
- {
- int s, tmp;
- memset(&PicoMem,0,sizeof(PicoMem));
- memset(&Pico.video,0,sizeof(Pico.video));
- memset(&Pico.m,0,sizeof(Pico.m));
- Pico.m.pal = 0;
- // calculate a mask for bank writes.
- // ROM loader has aligned the size for us, so this is safe.
- s = 0; tmp = Pico.romsize;
- while ((tmp >>= 1) != 0)
- s++;
- if (Pico.romsize > (1 << s))
- s++;
- tmp = 1 << s;
- bank_mask = (tmp - 1) >> 14;
- PicoReset();
- }
- void PicoMemSetupMS(void)
- {
- z80_map_set(z80_read_map, 0x0000, 0xbfff, Pico.rom, 0);
- z80_map_set(z80_read_map, 0xc000, 0xdfff, PicoMem.zram, 0);
- z80_map_set(z80_read_map, 0xe000, 0xffff, PicoMem.zram, 0);
- z80_map_set(z80_write_map, 0x0000, 0xbfff, xwrite, 1);
- z80_map_set(z80_write_map, 0xc000, 0xdfff, PicoMem.zram, 0);
- z80_map_set(z80_write_map, 0xe000, 0xffff, xwrite, 1);
-
- #ifdef _USE_DRZ80
- drZ80.z80_in = z80_sms_in;
- drZ80.z80_out = z80_sms_out;
- #endif
- #ifdef _USE_CZ80
- Cz80_Set_INPort(&CZ80, z80_sms_in);
- Cz80_Set_OUTPort(&CZ80, z80_sms_out);
- #endif
- // memory mapper setup, linearly mapped, default is Sega mapper
- Pico.ms.carthw[0x00] = 4;
- Pico.ms.carthw[0x01] = 5;
- Pico.ms.carthw[0x02] = 2;
- Pico.ms.carthw[0x03] = 3;
- Pico.ms.carthw[0x0c] = 0;
- Pico.ms.carthw[0x0d] = 0;
- Pico.ms.carthw[0x0e] = 1;
- Pico.ms.carthw[0x0f] = 2;
- Pico.ms.mapper = 0;
- }
- void PicoStateLoadedMS(void)
- {
- if (Pico.ms.mapper) {
- xwrite(0x0000, Pico.ms.carthw[0]);
- xwrite(0x0001, Pico.ms.carthw[1]);
- xwrite(0x0002, Pico.ms.carthw[2]);
- xwrite(0x0003, Pico.ms.carthw[3]);
- } else {
- xwrite(0xfffc, Pico.ms.carthw[0x0c]);
- xwrite(0xfffd, Pico.ms.carthw[0x0d]);
- xwrite(0xfffe, Pico.ms.carthw[0x0e]);
- xwrite(0xffff, Pico.ms.carthw[0x0f]);
- }
- }
- void PicoFrameMS(void)
- {
- struct PicoVideo *pv = &Pico.video;
- int is_pal = Pico.m.pal;
- int lines = is_pal ? 313 : 262;
- int cycles_line = is_pal ? 58020 : 58293; /* (226.6 : 227.7) * 256 */
- int cycles_done = 0, cycles_aim = 0;
- int skip = PicoIn.skipFrame;
- int lines_vis = 192;
- int hint; // Hint counter
- int nmi;
- int y;
- PsndStartFrame();
- nmi = (PicoIn.pad[0] >> 7) & 1;
- if (!Pico.ms.nmi_state && nmi)
- z80_nmi();
- Pico.ms.nmi_state = nmi;
- if ((pv->reg[0] & 6) == 6 && (pv->reg[1] & 0x18))
- lines_vis = (pv->reg[1] & 0x08) ? 240 : 224;
- PicoFrameStartSMS();
- hint = pv->reg[0x0a];
- for (y = 0; y < lines; y++)
- {
- pv->v_counter = Pico.m.scanline = y;
- if (y > 218)
- pv->v_counter = y - 6;
- if (y < lines_vis && !skip)
- PicoLineSMS(y);
- if (y <= lines_vis)
- {
- if (--hint < 0)
- {
- hint = pv->reg[0x0a];
- pv->pending_ints |= 2;
- if (pv->reg[0] & 0x10) {
- elprintf(EL_INTS, "hint");
- z80_int_assert(1);
- }
- }
- }
- else if (y == lines_vis + 1) {
- pv->pending_ints |= 1;
- if (pv->reg[1] & 0x20) {
- elprintf(EL_INTS, "vint");
- z80_int_assert(1);
- }
- }
- cycles_aim += cycles_line;
- Pico.t.z80c_aim = cycles_aim >> 8;
- cycles_done += z80_run((cycles_aim - cycles_done) >> 8) << 8;
- }
- if (PicoIn.sndOut)
- PsndGetSamplesMS(lines);
- }
- void PicoFrameDrawOnlyMS(void)
- {
- int lines_vis = 192;
- int y;
- PicoFrameStartSMS();
- for (y = 0; y < lines_vis; y++)
- PicoLineSMS(y);
- }
- // vim:ts=2:sw=2:expandtab
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