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Mapper 225: Implement extra RAM 

Some multicarts are buggy without extra ram implemented,

Fix https://github.com/TASEmulators/fceux/issues/467
This commit is contained in:
negative 2022-03-07 09:11:52 +08:00
parent bef4e80e08
commit 7f4eb7e14f
1 changed files with 11 additions and 1 deletions
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12
src/boards/225.cpp
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@ -52,15 +52,23 @@ static DECLFW(M225Write) {
}
static DECLFW(M225LoWrite) {
if (A & 0x800) {
prot[A & 0x03] = V;
}
}
static DECLFR(M225LoRead) {
return 0;
if (A & 0x800) {
return prot[A & 3] & 0x0F;
}
return X.DB;
}
static void M225Power(void) {
prg = 0;
chr = 0;
mode = 0;
mirr = 0;
Sync();
SetReadHandler(0x5000, 0x5FFF, M225LoRead);
SetWriteHandler(0x5000, 0x5FFF, M225LoWrite);
@ -70,7 +78,9 @@ static void M225Power(void) {
static void M225Reset(void) {
prg = 0;
chr = 0;
mode = 0;
mirr = 0;
Sync();
}