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[WIP] solving mappers with bus conflicts

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solving mappers with bus conflicts, mapper 2 is fixed, more to come after more testing
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nsx0r 2022-12-10 15:05:16 +01:00 committed by GitHub
parent 93fba20d62
commit 95e795023d
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1 changed files with 67 additions and 52 deletions
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23
Cart_Reader/NES.ino
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@ -2497,6 +2497,7 @@ void readPRG(boolean readrom) {
} }
word base = 0x8000; word base = 0x8000;
bool busConflict = false;
if (myFile) { if (myFile) {
switch (mapper) { switch (mapper) {
@ -2531,13 +2532,27 @@ void readPRG(boolean readrom) {
} }
break; break;
case 2: // 128K/256K case 2: // bus conflicts - fixed last bank
for (int i = 0; i < 8; i++) { // 128K/256K banks = int_pow(2, prgsize);
write_prg_byte(0x8000, i); busConflict = true;
for (word address = 0x0; address < (((word)prgsize - 3) * 0x4000) + 0x4000; address += 512) { for (int i = 0; i < banks-1; i++) {
for (int x = 0; x < 0x4000; x++) {
if (read_prg_byte(0xC000 + x) == i) {
write_prg_byte(0xC000 + x, i);
busConflict = false;
break;
}
}
if (busConflict) {
write_prg_byte(0x8000 + i, i);
}
for (word address = 0x0; address < 0x4000; address += 512) {
dumpPRG(base, address); dumpPRG(base, address);
} }
} }
for (word address = 0x4000; address < 0x8000; address += 512) {
dumpPRG(base, address);
}
break; break;
case 4: case 4: