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core, preparations for sc-3000 support

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This commit is contained in:
kub 2023-02-18 20:57:16 +00:00
parent ecf8764253
commit cab84f29e5
10 changed files with 66 additions and 18 deletions
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64
pico/sms.c
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@ -189,14 +189,20 @@ static unsigned char z80_sms_in(unsigned short a)
break;
case 0xc0: /* I/O port A and B */
d = ~((PicoIn.pad[0] & 0x3f) | (PicoIn.pad[1] << 6));
if (! (Pico.m.hardware & PMS_HW_SC) || (Pico.ms.io_sg & 7) == 7)
d = ~((PicoIn.pad[0] & 0x3f) | (PicoIn.pad[1] << 6));
else
; // read kbd 8 bits
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;
if (Pico.ms.io_ctl & 0x08) d |= 0x80; // TH as input is unconnected
if (Pico.ms.io_ctl & 0x02) d |= 0x40;
if (! (Pico.m.hardware & PMS_HW_SC) || (Pico.ms.io_sg & 7) == 7) {
d = (Pico.ms.io_ctl & 0x80) | ((Pico.ms.io_ctl << 1) & 0x40) | 0x30;
d |= ~(PicoIn.pad[1] >> 2) & 0x0f;
if (Pico.ms.io_ctl & 0x08) d |= 0x80; // TH as input is unconnected
if (Pico.ms.io_ctl & 0x02) d |= 0x40;
} else
; // read kbd 4 bits
break;
}
}
@ -209,7 +215,7 @@ static void z80_sms_out(unsigned short a, unsigned char d)
elprintf(EL_IO, "z80 port %04x write %02x", a, d);
a &= 0xff;
if(a >= 0xf0){
if (a >= 0xf0){
if (PicoIn.opt & POPT_EN_YM2413){
switch(a)
{
@ -228,7 +234,7 @@ static void z80_sms_out(unsigned short a, unsigned char d)
}
}
}
else{
else {
switch (a & 0xc1)
{
case 0x00:
@ -259,6 +265,10 @@ static void z80_sms_out(unsigned short a, unsigned char d)
case 0x81:
vdp_ctl_write(d);
break;
case 0xc0:
if ((Pico.m.hardware & PMS_HW_SC) && (a & 0x2))
Pico.ms.io_sg = d; // 0xc2 = kbd/pad select
}
}
}
@ -488,6 +498,25 @@ static void write_bank_x8k(unsigned short a, unsigned char d)
z80_map_set(z80_write_map, a, a+0x1fff, PicoMem.vram+0x4000, 0);
}
// SC-3000 32KB RAM mapper for BASIC level IIIB. 32KB RAM at address 0x8000
static void write_bank_x32k(unsigned short a, unsigned char d)
{
// 32KB address range @ 0x8000
if ((a&0xc000) != 0x8000) return;
if (Pico.ms.mapper != PMS_MAP_32KBRAM &&
(Pico.ms.mapper || Pico.romsize > 0x8000)) return;
elprintf(EL_Z80BNK, "bank x32k %04x %02x @ %04x", a, d, z80_pc());
((unsigned char *)(PicoMem.vram+0x4000))[a&0x7fff] = d;
Pico.ms.mapper = PMS_MAP_32KBRAM;
a &= 0xc000;
Pico.ms.carthw[0] = a >> 12;
// NB this deactivates internal RAM and all mapper detection
z80_map_set(z80_read_map, a, a+0x7fff, PicoMem.vram+0x4000, 0);
z80_map_set(z80_write_map, a, a+0x7fff, PicoMem.vram+0x4000, 0);
}
char *mappers[] = {
[PMS_MAP_SEGA] = "Sega",
[PMS_MAP_CODEM] = "Codemasters",
@ -499,6 +528,7 @@ char *mappers[] = {
[PMS_MAP_NEMESIS] = "Korea Nemesis",
[PMS_MAP_8KBRAM] = "Taiwan 8K RAM",
[PMS_MAP_XOR] = "Korea XOR",
[PMS_MAP_32KBRAM] = "Sega 32K RAM",
};
// TODO auto-selecting is not really reliable.
@ -519,15 +549,18 @@ 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_32KBRAM: write_bank_x32k(a, d); break;
case PMS_MAP_XOR: write_bank_xor(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
if (Pico.m.hardware & PMS_HW_SG)
if (Pico.m.hardware & PMS_HW_SC) {
write_bank_x32k(a,d);
} else if (Pico.m.hardware & PMS_HW_SG) {
write_bank_x8k(a, d);
else {
} else {
write_bank_n32k(a, d);
write_bank_sega(a, d);
write_bank_msx(a, d);
@ -562,10 +595,11 @@ void PicoResetMS(void)
// set preselected hw/mapper from config
if (PicoIn.hwSelect) {
Pico.m.hardware &= ~(PMS_HW_GG|PMS_HW_SG);
Pico.m.hardware &= ~(PMS_HW_GG|PMS_HW_SG|PMS_HW_SC);
switch (PicoIn.hwSelect) {
case PHWS_GG: Pico.m.hardware |= PMS_HW_GG; break;
case PHWS_SG: Pico.m.hardware |= PMS_HW_SG; break;
case PHWS_SC: Pico.m.hardware |= PMS_HW_SC; break;
}
}
Pico.ms.mapcnt = Pico.ms.mapper = 0;
@ -580,7 +614,7 @@ void PicoResetMS(void)
if (!memcmp(Pico.rom + tmr-16, "TMR SEGA", 8)) {
hw = Pico.rom[tmr-1] >> 4;
if (!PicoIn.hwSelect) {
Pico.m.hardware &= ~(PMS_HW_GG|PMS_HW_SG);
Pico.m.hardware &= ~(PMS_HW_GG|PMS_HW_SG|PMS_HW_SC);
if (hw >= 0x5 && hw < 0x8)
Pico.m.hardware |= PMS_HW_GG; // GG cartridge detected
}
@ -654,12 +688,14 @@ void PicoMemSetupMS(void)
u8 mapper = Pico.ms.mapper;
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, 0xc000, 0xdfff, PicoMem.zram, 0);
z80_map_set(z80_write_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);
z80_map_set(z80_write_map, 0xfc00, 0xffff, xwrite, 1);
// Nemesis mapper maps last 8KB rom bank #15 to adress 0
if (mapper == PMS_MAP_NEMESIS && Pico.romsize > 0x1e000)
@ -712,7 +748,7 @@ void PicoMemSetupMS(void)
void PicoStateLoadedMS(void)
{
u8 mapper = Pico.ms.mapper;
if (mapper == PMS_MAP_8KBRAM) {
if (mapper == PMS_MAP_8KBRAM || mapper == PMS_MAP_32KBRAM) {
u16 a = Pico.ms.carthw[0] << 12;
xwrite(a, *(unsigned char *)(PicoMem.vram+0x4000));
} else if (mapper == PMS_MAP_MSX || mapper == PMS_MAP_NEMESIS) {