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mcd, fix pulldowns only there if cd attached

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This commit is contained in:
kub 2021-07-01 21:26:57 +02:00
parent ef4f41a855
commit 5c73f9d050
1 changed files with 2 additions and 2 deletions
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4
pico/memory.c
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@ -116,13 +116,13 @@ void cpu68k_map_all_ram(int start_addr, int end_addr, void *ptr, int is_sub)
static u32 m68k_unmapped_read8(u32 a) static u32 m68k_unmapped_read8(u32 a)
{ {
elprintf(EL_UIO, "m68k unmapped r8 [%06x] @%06x", a, SekPc); elprintf(EL_UIO, "m68k unmapped r8 [%06x] @%06x", a, SekPc);
return 0; // assume pulldown, as if MegaCD2 was attached return (PicoIn.AHW & PAHW_MCD) ? 0x00 : 0xff; // pulldown if MegaCD2 attached
} }
static u32 m68k_unmapped_read16(u32 a) static u32 m68k_unmapped_read16(u32 a)
{ {
elprintf(EL_UIO, "m68k unmapped r16 [%06x] @%06x", a, SekPc); elprintf(EL_UIO, "m68k unmapped r16 [%06x] @%06x", a, SekPc);
return 0; return (PicoIn.AHW & PAHW_MCD) ? 0x00 : 0xffff;
} }
static void m68k_unmapped_write8(u32 a, u32 d) static void m68k_unmapped_write8(u32 a, u32 d)