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Mapper 235: Update support for 260-in-1 and add UNROM mode 

- Using Soft-reset with switch between multicarts or the extra PRG rom
  which loads Contra game.

Fix: https://github.com/TASEmulators/fceux/issues/489
This commit is contained in:
negative 2022-06-01 16:39:46 +08:00 committed by zeromus
parent 971d7212ee
commit 2e70e27ba0
1 changed files with 58 additions and 11 deletions
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69
src/boards/235.cpp
View File

@ -19,36 +19,79 @@
*/
#include "mapinc.h"
#include "ines.h"
static uint16 cmdreg = 0;
static uint8 openbus = 0;
// For carts with extra 128K prg rom (Contra)
static uint8 unrom = 0;
static uint8 unromData = 0;
static uint32 PRGROMSize = 0;
static uint16 cmdreg;
static SFORMAT StateRegs[] =
{
{ &cmdreg, 2, "CREG" },
{ &openbus, 1, "OB" },
{ &unrom, 1, "UROM" },
{ &unromData, 1, "UDTA" },
{ 0 }
};
static void Sync(void) {
if (cmdreg & 0x400)
setmirror(MI_0);
else
setmirror(((cmdreg >> 13) & 1) ^ 1);
if (cmdreg & 0x800) {
setprg16(0x8000, ((cmdreg & 0x300) >> 3) | ((cmdreg & 0x1F) << 1) | ((cmdreg >> 12) & 1));
setprg16(0xC000, ((cmdreg & 0x300) >> 3) | ((cmdreg & 0x1F) << 1) | ((cmdreg >> 12) & 1));
} else
setprg32(0x8000, ((cmdreg & 0x300) >> 4) | (cmdreg & 0x1F));
if (unrom) {
int PRGPageCount = PRGROMSize / (16 * 1024);
setprg16(0x8000, PRGPageCount & 0xC0 | (unromData & 7));
setprg16(0xC000, PRGPageCount & 0xC0 | 7);
setmirror(MI_V);
} else {
uint8 bank = ((cmdreg & 0x300) >> 3) | (cmdreg & 0x1F);
if (bank >= (PRGROMSize / (32 * 1024))) {
openbus = 1;
} else {
if (cmdreg & 0x400)
setmirror(MI_0);
else
setmirror(((cmdreg >> 13) & 1) ^ 1);
if (cmdreg & 0x800) {
setprg16(0x8000, (bank << 1) | ((cmdreg >> 12) & 1));
setprg16(0xC000, (bank << 1) | ((cmdreg >> 12) & 1));
} else
setprg32(0x8000, bank);
}
}
}
static DECLFR(M235Read) {
if (openbus) {
openbus = 0;
return X.DB;
}
return CartBR(A);
}
static DECLFW(M235Write) {
cmdreg = A;
unromData = V;
Sync();
}
static void M235Reset(void) {
cmdreg = 0;
unromData = 0;
if (PRGROMSize & 0x20000)
unrom = (unrom + 1) & 1;
Sync();
}
static void M235Power(void) {
setchr8(0);
SetWriteHandler(0x8000, 0xFFFF, M235Write);
SetReadHandler(0x8000, 0xFFFF, CartBR);
SetReadHandler(0x8000, 0xFFFF, M235Read);
cmdreg = 0;
unromData = 0;
unrom = 0;
Sync();
}
@ -57,7 +100,11 @@ static void M235Restore(int version) {
}
void Mapper235_Init(CartInfo *info) {
info->Reset = M235Reset;
info->Power = M235Power;
GameStateRestore = M235Restore;
AddExState(&StateRegs, ~0, 0, 0);
// needs raw, non-pow2 PRGROM size for comparison
PRGROMSize = head.ROM_size * 16384;
}