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sms, memory mapping changes

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especially most korean games work with this
This commit is contained in:
kub 2021-10-20 21:02:52 +02:00
parent 4dbd5223b1
commit 8ba60e3172
1 changed files with 31 additions and 24 deletions
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55
pico/sms.c
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@ -195,17 +195,14 @@ static void z80_sms_out(unsigned short a, unsigned char d)
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;
}
}
@ -261,8 +258,11 @@ static void write_sram(unsigned short a, unsigned char 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());
if (Pico.ms.mapper != 1 && d == 0) return;
elprintf(EL_Z80BNK, "bank 16k %04x %02x @ %04x", a, d, z80_pc());
Pico.ms.mapper = 1;
Pico.ms.carthw[a & 0x0f] = d;
switch (a & 0x0f)
{
case 0x0d:
@ -295,7 +295,8 @@ static void write_bank_sega(unsigned short a, unsigned char d)
// 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
elprintf(EL_Z80BNK, "bank 8k %04x %02x @ %04x", a, d, z80_pc());
Pico.ms.mapper = 2; // TODO define (more) mapper types
Pico.ms.carthw[a] = d;
a = (a^2)*0x2000 + 0x4000;
@ -311,20 +312,20 @@ static void xwrite(unsigned int a, unsigned char d)
PicoMem.zram[a & 0x1fff] = d;
// Sega. Maps 4 bank 16KB each
if (a >= 0xfff8 /*&& !Pico.ms.mapper*/)
if (a >= 0xfff8 && Pico.ms.mapper != 2)
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)
// if (a == 0x0000 && Pico.ms.mapper != 2)
// write_bank_sega(0xfffd, d);
if (a == 0x4000 && Pico.ms.mapper != 2)
write_bank_sega(0xfffe, d);
if (a == 0x8000)
if (a == 0x8000 && Pico.ms.mapper != 2)
write_bank_sega(0xffff, d);
// Korean. 1 selectable 16KB bank at the top
if (a == 0xa000)
if (a == 0xa000 && Pico.ms.mapper != 2)
write_bank_sega(0xffff, d);
// MSX. 4 selectable 8KB banks at the top
if (a <= 0x0003 && (a || Pico.ms.mapper))
if (a <= 0x0003 && Pico.ms.mapper != 1 && (a|d))
write_bank_msx(a, d);
}
@ -376,6 +377,7 @@ void PicoPowerMS(void)
tmp = 1 << s;
bank_mask = (tmp - 1) >> 14;
Pico.ms.mapper = 0;
PicoReset();
}
@ -398,22 +400,26 @@ void PicoMemSetupMS(void)
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;
// memory mapper setup
u8 mapper = Pico.ms.mapper;
if (Pico.ms.mapper == 2) {
xwrite(0x0000, 0);
xwrite(0x0001, 0);
xwrite(0x0002, 0);
xwrite(0x0003, 0);
} else {
xwrite(0xfffc, 0);
xwrite(0xfffd, 0);
xwrite(0xfffe, 1);
xwrite(0xffff, 2);
}
Pico.ms.mapper = mapper;
}
void PicoStateLoadedMS(void)
{
if (Pico.ms.mapper) {
u8 mapper = Pico.ms.mapper;
if (Pico.ms.mapper == 2) {
xwrite(0x0000, Pico.ms.carthw[0]);
xwrite(0x0001, Pico.ms.carthw[1]);
xwrite(0x0002, Pico.ms.carthw[2]);
@ -424,6 +430,7 @@ void PicoStateLoadedMS(void)
xwrite(0xfffe, Pico.ms.carthw[0x0e]);
xwrite(0xffff, Pico.ms.carthw[0x0f]);
}
Pico.ms.mapper = mapper;
}
void PicoFrameMS(void)