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mcd, preparations for msu support

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This commit is contained in:
kub 2023-05-26 19:09:37 +00:00
parent 178a9b683c
commit 02ff025479
15 changed files with 153 additions and 170 deletions
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10
pico/videoport.c
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@ -533,13 +533,13 @@ static void DmaSlow(int len, u32 source)
{
u8 r3 = Pico_mcd->s68k_regs[3];
elprintf(EL_VDPDMA, "DmaSlow CD, r3=%02x", r3);
if (source < 0x20000) { // Bios area
base = (u16 *)Pico_mcd->bios;
} else if ((source & 0xfc0000) == 0x200000) { // Word Ram
if (source < Pico.romsize /*0x20000*/) { // Bios area
base = (u16 *)(Pico.rom + (source & 0xfe0000));
} else if ((source & 0xfc0000) == pcd_base_address+0x200000) { // Word Ram
if (!(r3 & 4)) { // 2M mode
base = (u16 *)(Pico_mcd->word_ram2M + (source & 0x20000));
} else {
if (source < 0x220000) { // 1M mode
if ((source & 0xfe0000) < pcd_base_address+0x220000) { // 1M mode
int bank = r3 & 1;
base = (u16 *)(Pico_mcd->word_ram1M[bank]);
} else {
@ -548,7 +548,7 @@ static void DmaSlow(int len, u32 source)
}
}
source -= 2;
} else if ((source & 0xfe0000) == 0x020000) { // Prg Ram
} else if ((source & 0xfe0000) == pcd_base_address+0x020000) { // Prg Ram
base = (u16 *)Pico_mcd->prg_ram_b[r3 >> 6];
source -= 2; // XXX: test
}