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sms, add xor 4x8k mapper

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This commit is contained in:
kub 2022-09-14 19:29:02 +00:00
parent f9b966dec6
commit 7c6f79147b
4 changed files with 33 additions and 6 deletions
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32
pico/sms.c
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@ -454,6 +454,23 @@ static void write_bank_jang(unsigned short a, unsigned char d)
}
}
// Korean 188-in-1. 4 8KB banks from 0x4000, selected by xor'd bank index
static void write_bank_xor(unsigned short a, unsigned char d)
{
// 4x8KB bank select @0x2000
if ((a&0x6000) != 0x2000) return;
if (Pico.ms.mapper != PMS_MAP_XOR && Pico.ms.mapper) return;
elprintf(EL_Z80BNK, "bank 32k %04x %02x @ %04x", a, d, z80_pc());
Pico.ms.mapper = PMS_MAP_XOR;
Pico.ms.carthw[0] = d;
z80_map_set(z80_read_map, 0x4000, 0x5fff, Pico.rom + ((d^0x1f) << 13), 0);
z80_map_set(z80_read_map, 0x6000, 0x7fff, Pico.rom + ((d^0x1e) << 13), 0);
z80_map_set(z80_read_map, 0x8000, 0x9fff, Pico.rom + ((d^0x1d) << 13), 0);
z80_map_set(z80_read_map, 0xa000, 0xbfff, Pico.rom + ((d^0x1c) << 13), 0);
}
// SG-1000 8KB RAM Adaptor mapper. 8KB RAM at address 0x2000
static void write_bank_x8k(unsigned short a, unsigned char d)
{
@ -481,6 +498,7 @@ char *mappers[] = {
[PMS_MAP_JANGGUN] = "Korea Janggun",
[PMS_MAP_NEMESIS] = "Korea Nemesis",
[PMS_MAP_8KBRAM] = "Taiwan 8K RAM",
[PMS_MAP_XOR] = "Korea XOR",
};
// TODO auto-selecting is not really reliable.
@ -501,6 +519,7 @@ static void xwrite(unsigned int a, unsigned char d)
case PMS_MAP_JANGGUN: write_bank_jang(a, d); break;
case PMS_MAP_NEMESIS: write_bank_msxn(a, d); break;
case PMS_MAP_8KBRAM: write_bank_x8k(a, d); break;
case PMS_MAP_XOR: write_bank_xor(a, d); break;
case PMS_MAP_AUTO:
// disable autodetection after some time
@ -515,6 +534,7 @@ static void xwrite(unsigned int a, unsigned char d)
write_bank_codem(a, d);
write_bank_korea(a, d);
write_bank_n16k(a, d);
write_bank_xor(a, d);
}
Pico.ms.mapcnt ++;
@ -671,17 +691,21 @@ void PicoMemSetupMS(void)
} else if (mapper == PMS_MAP_JANGGUN) {
xwrite(0xfffe, 1);
xwrite(0xffff, 2);
} else if (mapper == PMS_MAP_XOR) {
xwrite(0x2000, 0);
} else if (mapper == PMS_MAP_CODEM) {
xwrite(0x0000, 0);
xwrite(0x4000, 1);
xwrite(0x8000, 2);
} else if (mapper != PMS_MAP_8KBRAM) {
// pre-initialize Sega mapper to linear mapping (else state load may fail)
} else if (mapper == PMS_MAP_SEGA) {
xwrite(0xfffc, 0);
xwrite(0xfffd, 0);
xwrite(0xfffe, 1);
xwrite(0xffff, 2);
Pico.ms.mapper = mapper;
} else if (mapper == PMS_MAP_AUTO) {
// pre-initialize Sega mapper to linear mapping (else state load may fail)
Pico.ms.carthw[0xe] = 0x1;
Pico.ms.carthw[0xf] = 0x2;
}
}
@ -709,6 +733,8 @@ void PicoStateLoadedMS(void)
xwrite(0x6000, Pico.ms.carthw[3]);
xwrite(0x8000, Pico.ms.carthw[4]);
xwrite(0xa000, Pico.ms.carthw[5]);
} else if (mapper == PMS_MAP_XOR) {
xwrite(0x2000, Pico.ms.carthw[0]);
} else if (mapper == PMS_MAP_CODEM) {
xwrite(0x0000, Pico.ms.carthw[0]);
xwrite(0x4000, Pico.ms.carthw[1]);