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fix #635 (<=2K ROMs rewind broken)

This commit is contained in:
thrust26 2020-05-13 10:56:34 +02:00
parent 020dea9cc8
commit 35a113b628
1 changed files with 4 additions and 1 deletions
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5
src/emucore/CartEnhanced.cxx
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@ -40,7 +40,10 @@ void CartridgeEnhanced::install(System& system)
// calculate bank switching and RAM sizes and masks
myBankSize = 1 << myBankShift; // e.g. = 2 ^ 12 = 4K = 0x1000
myBankMask = myBankSize - 1; // e.g. = 0x0FFF
myBankSegs = 1 << (MAX_BANK_SHIFT - myBankShift); // e.g. = 1
// Either the bankswitching supports multiple segments
// or the ROM is < 4K (-> 1 segment)
myBankSegs = std::min(1 << (MAX_BANK_SHIFT - myBankShift),
int(mySize) / myBankSize); // e.g. = 1
myRomOffset = myRamBankCount > 0 ? 0 : uInt32(myRamSize) * 2;
myRamMask = ramSize - 1; // e.g. = 0xFFFF (doesn't matter for RAM size 0)
myWriteOffset = myRamWpHigh ? ramSize : 0; // e.g. = 0x0000