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Backport r175, r176 and r177 - UNIF COOLBOY fixes

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Oggom
2015-07-26 22:32:47 +02:00
parent 1d33799c0c
commit 798d8d9aa4
1 changed files with 22 additions and 12 deletions
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34
src/boards/coolboy.c
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@@ -41,7 +41,12 @@ static void COOLBOYCW(uint32 A, uint8 V) {
case 0x0C00: V &= 0x7F; break;
}
}
setchr8((((EXPREGS[2] & 0x0F) | ((V & 0x80) >> 3)) & (mask >> 3)) | ((((EXPREGS[0] & 0x08) << 4) & ~mask) >> 3));
// Highest bit goes from MMC3 registers when EXPREGS[3]&0x80==0 or from EXPREGS[0]&0x08 otherwise
setchr1(A,
(V & 0x80 & mask) | ((((EXPREGS[0] & 0x08) << 4) & ~mask)) // 7th bit
| ((EXPREGS[2] & 0x0F) << 3) // 6-3 bits
| ((A >> 10) & 7) // 2-0 bits
);
} else {
if (EXPREGS[3] & 0x40) { // Weird mode, again
int cbase = (MMC3_cmd & 0x80) << 5;
@@ -52,7 +57,9 @@ static void COOLBOYCW(uint32 A, uint8 V) {
case 0x0C00: V = 0; break;
}
}
setchr1(A, (V & mask) | (((EXPREGS[0] & 0x08) << 4) & (mask ^ 0xff)));
// Simple MMC3 mode
// Highest bit goes from MMC3 registers when EXPREGS[3]&0x80==0 or from EXPREGS[0]&0x08 otherwise
setchr1(A, (V & mask) | (((EXPREGS[0] & 0x08) << 4) & ~mask));
}
}
@@ -65,10 +72,10 @@ static void COOLBOYPW(uint32 A, uint8 V) {
if ((EXPREGS[3] & 0x40) && (V >= 0xFE) && !((MMC3_cmd & 0x40) != 0)) {
switch (A & 0xE000) {
case 0xA000:
if ((MMC3_cmd & 0x40) != 0) V = 0;
if ((MMC3_cmd & 0x40)) V = 0;
break;
case 0xC000:
if ((MMC3_cmd & 0x40) == 0) V = 0;
if (!(MMC3_cmd & 0x40)) V = 0;
break;
case 0xE000:
V = 0;
@@ -76,18 +83,20 @@ static void COOLBOYPW(uint32 A, uint8 V) {
}
}
// Regular MMC3 mode, internal ROM size can be up to 2048kb! Minimal is 64kb
// Regular MMC3 mode, internal ROM size can be up to 2048kb!
if (!(EXPREGS[3] & 0x10))
setprg8(A, (((base << 4) & ~mask)) | (V & mask));
else { // NROM mode
mask &= 0xF0;
uint8 emask;
if (!(EXPREGS[1] & 2)) // 4kb mode, 0xC000-0xFFFF is same as 0x8000-0xBFFF
if ((((EXPREGS[1] & 2) != 0))) // 32kb mode
emask = (EXPREGS[3] & 0x0C) | ((A & 0x4000) >> 13);
else // 16kb mode
emask = EXPREGS[3] & 0x0E;
else // 8kb mode, using second-last bank
emask = (EXPREGS[3] & 0x0C) | ((A >= 0xC000) ? 2 : 0);
emask |= (A >> 13) & 1; // does not depends on MMC3_cmd&0x40
setprg8(A, (((base << 4) & ~mask) | (V & mask) | emask));
setprg8(A, ((base << 4) & ~mask) // 7-4 bits are from base (see below)
| (V & mask) // ... or from MM3 internal regs, depends on mask
| emask // 3-1 (or 3-2 when (EXPREGS[3]&0x0C is set) from EXPREGS[3]
| ((A & 0x2000) >> 13)); // 0th just as is
}
}
@@ -95,7 +104,8 @@ static DECLFW(COOLBOYWrite) {
if(A001B & 0x80)
CartBW(A,V);
if((EXPREGS[3] & 0x80) == 0) {
// Deny any further writes when 7th bit is 1 AND 4th is 0
if ((EXPREGS[3] & 0x90) != 0x80) {
EXPREGS[A & 3] = V;
FixMMC3PRG(MMC3_cmd);
FixMMC3CHR(MMC3_cmd);
@@ -123,7 +133,7 @@ static void COOLBOYPower(void) {
FixMMC3PRG(MMC3_cmd);
FixMMC3CHR(MMC3_cmd);
SetWriteHandler(0x5000, 0x5fff, CartBW); // some games access random unmapped areas and crashes because of KT-008 PCB hack in MMC3 source lol
SetWriteHandler(0x6000, 0x6fff, COOLBOYWrite);
SetWriteHandler(0x6000, 0x7fff, COOLBOYWrite);
}
void COOLBOY_Init(CartInfo *info) {