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Mapper 339: Simplify submapper 2 and reduce the number of EXPREGS accordingly.

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This commit is contained in:
NewRisingSun
2025-09-19 23:39:59 +02:00
parent a75f70b3ff
commit 7e75e786eb
1 changed files with 7 additions and 8 deletions
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15
src/boards/bmck3006.c
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@@ -29,7 +29,7 @@
static uint8 submapper; /* 0: K-3006, 1: unmarked, 2: TL 8058, 3: K-3091/GN-16 */
static DECLFR (readPad) {
return CartBR(A &~3 | EXPREGS[2] &3);
return CartBR(A &~3 | EXPREGS[1] &3);
}
static void BMCK3006CW(uint32 A, uint8 V) {
@@ -41,8 +41,8 @@ static void BMCK3006PW(uint32 A, uint8 V) {
setprg8(A, (V & 0x0F) | (EXPREGS[0] & 0x18) << 1);
} else {
if (submapper ==0 && (EXPREGS[0] & 0x06) == 0x06 ||
submapper ==1 && EXPREGS[0] &4 ||
submapper ==2 && (EXPREGS[0] &1 || EXPREGS[1] &1) ||
submapper ==1 && EXPREGS[0] &0x04 ||
submapper ==2 && EXPREGS[0] &0x11 ||
submapper ==3 && EXPREGS[0] &0x18 ||
submapper ==4 && EXPREGS[0] &0x14) { /* NROM-256 */
setprg32(0x8000, (EXPREGS[0] >> 1) & 0x0F);
@@ -55,20 +55,19 @@ static void BMCK3006PW(uint32 A, uint8 V) {
static DECLFW(BMCK3006Write) {
EXPREGS[0] = A &0xFF;
EXPREGS[1] = A >>8 &0xFF;
FixMMC3PRG(MMC3_cmd);
FixMMC3CHR(MMC3_cmd);
if (submapper == 2 || submapper == 3) SetReadHandler(0x8000, 0xFFFF, EXPREGS[0] &0x80? readPad: CartBR);
}
static void BMCK3006Reset(void) {
EXPREGS[0] = EXPREGS[1] = 0;
EXPREGS[2]++;
EXPREGS[0] = 0;
EXPREGS[1]++;
MMC3RegReset();
}
static void BMCK3006Power(void) {
EXPREGS[0] = EXPREGS[1] = EXPREGS[2] = 0;
EXPREGS[0] = EXPREGS[1] = 0;
GenMMC3Power();
SetWriteHandler(0x6000, 0x7FFF, BMCK3006Write);
}
@@ -80,5 +79,5 @@ void BMCK3006_Init(CartInfo *info) {
cwrap = BMCK3006CW;
info->Power = BMCK3006Power;
info->Reset = BMCK3006Reset;
AddExState(EXPREGS, 3, 0, "EXPR");
AddExState(EXPREGS, 2, 0, "EXPR");
}