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Mapper 268: Correct GNROM mask for submapper 4, correctly apply CHR mask bits in register 2.

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NewRisingSun
2022-08-04 17:22:23 +02:00
parent 91867b9844
commit f3f1e1f916
1 changed files with 8 additions and 3 deletions
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11
src/boards/268.c
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@@ -50,7 +50,7 @@ static void Mapper268_PRGWrap(uint32 A, uint8 V) {
|EXPREGS[0] <<6 &0xC00;
break;
case 4: /* LD622D: PRG A20-21 moved to register 0 */
prgMaskGNROM =EXPREGS[3] &0x10? (EXPREGS[1] &0x10? 0x01: 0x03): 0x00;
prgMaskGNROM =EXPREGS[3] &0x10? (EXPREGS[1] &0x02? 0x03: 0x01): 0x00;
prgOffset =EXPREGS[3] &0x00E
|EXPREGS[0] <<4 &0x070
|EXPREGS[0] <<3 &0x180;
@@ -90,8 +90,13 @@ static DECLFW(Mapper268_WriteWRAM) {
}
static DECLFW(Mapper268_WriteReg) {
if (~EXPREGS[3] &0x80 || EXPREGS[3] &0x10) {
EXPREGS[A &7] =V;
int index =A &7;
if (~EXPREGS[3] &0x80 || index ==2) {
if (index ==2) {
if (EXPREGS[2] &0x80) V =V &0x0F | EXPREGS[2] &~0x0F;
V &=~EXPREGS[2] >>3 &0xE |0xF1;
}
EXPREGS[index] =V;
FixMMC3PRG(MMC3_cmd);
FixMMC3CHR(MMC3_cmd);
}