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sms, add sg-1000 support

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kub 2022-02-28 21:45:50 +00:00
parent 216c9f17fa
commit df6c895c5c
9 changed files with 72 additions and 41 deletions
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62
pico/sms.c
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@ -346,7 +346,7 @@ static void write_bank_msx(unsigned short a, unsigned char d)
{
if (a > 0x0003) return;
// don't detect linear mapping to avoid confusing with Codemasters
if (Pico.ms.mapper != PMS_MAP_MSX && (Pico.ms.mapper || (a|d) == 0)) return;
if (Pico.ms.mapper != PMS_MAP_MSX && (Pico.ms.mapper || (a|d) == 0 || d >= 0x80)) return;
elprintf(EL_Z80BNK, "bank msx %04x %02x @ %04x", a, d, z80_pc());
Pico.ms.mapper = PMS_MAP_MSX;
Pico.ms.carthw[a] = d;
@ -457,19 +457,32 @@ static void write_bank_jang(unsigned short a, unsigned char d)
// SG-1000 8KB RAM Adaptor mapper. 8KB RAM at address 0x2000
static void write_bank_x8k(unsigned short a, unsigned char d)
{
// 8KB address range @ 0x2000
// 8KB address range @ 0x2000 (adaptor) or @ 0x8000 (cartridge)
if ((a&0xe000) != 0x2000 && (a&0xe000) != 0x8000) return;
// this is only available on SG-1000
if (Pico.ms.mapper != PMS_MAP_8KBRAM && (Pico.ms.mapper || !(Pico.m.hardware & PMS_HW_SG))) return;
if (Pico.ms.mapper != PMS_MAP_8KBRAM && Pico.ms.mapper) return;
elprintf(EL_Z80BNK, "bank x8k %04x %02x @ %04x", a, d, z80_pc());
((unsigned char *)PicoMem.vram)[(a&0x1fff)+0x8000] = d;
Pico.ms.mapper = PMS_MAP_8KBRAM;
((unsigned char *)PicoMem.vram)[(a&0x1fff)+0x8000] = d;
a &= 0xe000;
Pico.ms.carthw[0] = a >> 12;
z80_map_set(z80_read_map, a, a+0x1fff, PicoMem.vram+0x4000, 0);
z80_map_set(z80_write_map, a, a+0x1fff, PicoMem.vram+0x4000, 0);
}
char *mappers[] = {
[PMS_MAP_SEGA] = "Sega",
[PMS_MAP_CODEM] = "Codemasters",
[PMS_MAP_KOREA] = "Korea",
[PMS_MAP_MSX] = "Korea MSX",
[PMS_MAP_N32K] = "Korea X-in-1",
[PMS_MAP_N16K] = "Korea 4-Pak",
[PMS_MAP_JANGGUN] = "Korea Janggun",
[PMS_MAP_NEMESIS] = "Korea Nemesis",
[PMS_MAP_8KBRAM] = "Taiwan 8K RAM",
};
// TODO auto-selecting is not really reliable.
// Before adding more mappers this should be revised.
static void xwrite(unsigned int a, unsigned char d)
@ -490,14 +503,23 @@ static void xwrite(unsigned int a, unsigned char d)
case PMS_MAP_8KBRAM: write_bank_x8k(a, d); break;
case PMS_MAP_AUTO:
// disable autodetection after some time
if ((a >= 0xc000 && a < 0xfff8) || Pico.ms.mapcnt > 20) break;
// NB the sequence of mappers is crucial for the auto detection
write_bank_x8k(a, d);
write_bank_n32k(a, d);
write_bank_sega(a, d);
write_bank_msx(a, d);
write_bank_codem(a, d);
write_bank_korea(a, d);
write_bank_n16k(a, d);
if (Pico.m.hardware & PMS_HW_SG)
write_bank_x8k(a, d);
else {
write_bank_n32k(a, d);
write_bank_sega(a, d);
write_bank_msx(a, d);
write_bank_codem(a, d);
write_bank_korea(a, d);
write_bank_n16k(a, d);
}
Pico.ms.mapcnt ++;
if (Pico.ms.mapper)
elprintf(EL_STATUS, "autodetected %s mapper",mappers[Pico.ms.mapper]);
break;
}
}
@ -520,23 +542,23 @@ void PicoResetMS(void)
// set preselected hw/mapper from config
if (PicoIn.hwSelect) {
Pico.m.hardware &= ~(PMS_HW_GG|PMS_HW_SG);
switch (PicoIn.hwSelect) {
case PHWS_GG: Pico.m.hardware |= PMS_HW_GG; break;
default: Pico.m.hardware &= ~PMS_HW_GG; break;
case PHWS_SG: Pico.m.hardware |= PMS_HW_SG; break;
}
}
Pico.ms.mapcnt = Pico.ms.mapper = 0;
if (PicoIn.mapper)
Pico.ms.mapper = PicoIn.mapper;
Pico.m.hardware |= PMS_HW_JAP; // default region Japan if no TMR header
Pico.m.hardware |= PMS_HW_SG; // default to SG-1000 if no TMR header
// check if the ROM header contains more system information
for (tmr = 0x2000; tmr < 0xbfff && tmr <= Pico.romsize; tmr *= 2) {
if (!memcmp(Pico.rom + tmr-16, "TMR SEGA", 8)) {
Pico.m.hardware &= ~PMS_HW_SG; // not SG-1000
hw = Pico.rom[tmr-1] >> 4;
if (!PicoIn.hwSelect) {
Pico.m.hardware &= ~PMS_HW_GG;
Pico.m.hardware &= ~(PMS_HW_GG|PMS_HW_SG);
if (hw >= 0x5 && hw < 0x8)
Pico.m.hardware |= PMS_HW_GG; // GG cartridge detected
}
@ -647,19 +669,21 @@ void PicoMemSetupMS(void)
xwrite(0x0000, 0);
xwrite(0x4000, 1);
xwrite(0x8000, 2);
} else {
} else if (mapper) {
xwrite(0xfffc, 0);
xwrite(0xfffd, 0);
xwrite(0xfffe, 1);
xwrite(0xffff, 2);
}
Pico.ms.mapper = mapper;
}
void PicoStateLoadedMS(void)
{
u8 mapper = Pico.ms.mapper;
if (Pico.ms.mapper == PMS_MAP_MSX || Pico.ms.mapper == PMS_MAP_NEMESIS) {
if (Pico.ms.mapper == PMS_MAP_8KBRAM) {
u16 a = Pico.ms.carthw[0] << 12;
xwrite(a+0x888, *((unsigned char *)PicoMem.vram+0x8888));
} else if (Pico.ms.mapper == PMS_MAP_MSX || Pico.ms.mapper == PMS_MAP_NEMESIS) {
xwrite(0x0000, Pico.ms.carthw[0]);
xwrite(0x0001, Pico.ms.carthw[1]);
xwrite(0x0002, Pico.ms.carthw[2]);