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sms, mapper for taiwanese sg-1000 ram extension

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This commit is contained in:
kub 2022-02-26 21:48:18 +00:00
parent aaef4b945e
commit 171fb8cc14
5 changed files with 11 additions and 2 deletions
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1
pico/pico_int.h
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@ -351,6 +351,7 @@ struct PicoMisc
#define PMS_MAP_N16K 6
#define PMS_MAP_JANGGUN 7
#define PMS_MAP_NEMESIS 8
#define PMS_MAP_8KBRAM 9
struct PicoMS
{

7
pico/sms.c
View file

@ -456,7 +456,12 @@ static void write_bank_jang(unsigned short a, unsigned char d)
static void write_bank_x8k(unsigned short a, unsigned char d)
{
// 8KB address range @ 0x2000
if ((a&0xe000) != 0x2000) return;
// never autodetected, selectable only via config
if (Pico.ms.mapper != PMS_MAP_8KBRAM) return;
elprintf(EL_Z80BNK, "bank x8k %04x %02x @ %04x", a, d, z80_pc());
((unsigned char *)PicoMem.vram)[a+0x6000] = d;
z80_map_set(z80_read_map, 0x2000, 0x3fff, PicoMem.vram+0x4000, 0);
z80_map_set(z80_write_map, 0x2000, 0x3fff, PicoMem.vram+0x4000, 0);
@ -479,6 +484,7 @@ static void xwrite(unsigned int a, unsigned char d)
case PMS_MAP_N16K: write_bank_n16k(a, d); break;
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_AUTO:
// NB the sequence of mappers is crucial for the auto detection
@ -488,7 +494,6 @@ 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_x8k(a, d);
break;
}
}