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Add fallback if ROM size in MD header is 0

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sanni 2023-02-19 21:45:52 +01:00
parent b623b46e4c
commit 782db58ab1
1 changed files with 11 additions and 9 deletions
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20
Cart_Reader/MD.ino
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@ -1091,6 +1091,17 @@ void getCartInfo_MD() {
cartSize = 0x80000; cartSize = 0x80000;
} }
// Some games are missing the ROM size in the header, in this case calculate ROM size by looking for mirror of the first line of the ROM
// This does not work for cartridges that have SRAM mapped directly after the maskrom like Striker (Europe)
if ((cartSize < 0x8000) || (cartSize > 0xEAF400)) {
for (cartSize = 0x20000 / 2; cartSize < 0x400000 / 2; cartSize += 0x20000 / 2) {
if ((readWord_MD(0x0) == readWord_MD(cartSize)) && (readWord_MD(0x1) == readWord_MD(0x1 + cartSize)) && (readWord_MD(0x2) == readWord_MD(0x2 + cartSize)) && (readWord_MD(0x3) == readWord_MD(0x3 + cartSize)) && (readWord_MD(0x4) == readWord_MD(0x4 + cartSize)) && (readWord_MD(0x5) == readWord_MD(0x5 + cartSize)) && (readWord_MD(0x6) == readWord_MD(0x6 + cartSize)) && (readWord_MD(0x7) == readWord_MD(0x7 + cartSize)) && (readWord_MD(0x8) == readWord_MD(0x8 + cartSize))) {
break;
}
}
cartSize = cartSize * 2;
}
display_Clear(); display_Clear();
println_Msg(F("Cart Info")); println_Msg(F("Cart Info"));
println_Msg(F(" ")); println_Msg(F(" "));
@ -1249,9 +1260,6 @@ void readROM_MD() {
byte buffer[1024] = { 0 }; byte buffer[1024] = { 0 };
// get current time
// unsigned long startTime = millis();
// Phantasy Star/Beyond Oasis with 74HC74 and 74HC139 switch ROM/SRAM at address 0x200000 // Phantasy Star/Beyond Oasis with 74HC74 and 74HC139 switch ROM/SRAM at address 0x200000
if (0x200000 < cartSize && cartSize < 0x400000) { if (0x200000 < cartSize && cartSize < 0x400000) {
enableSram_MD(0); enableSram_MD(0);
@ -1475,12 +1483,6 @@ void readROM_MD() {
writeSSF2Map(0x50987F, 7); // 0xA130FF writeSSF2Map(0x50987F, 7); // 0xA130FF
} }
// print elapsed time
//print_Msg(F("Time elapsed: "));
//print_Msg((millis() - startTime) / 1000);
//println_Msg(F("s"));
//display_Update();
// Calculate internal checksum // Calculate internal checksum
print_Msg(F("Internal checksum...")); print_Msg(F("Internal checksum..."));
display_Update(); display_Update();