Conditionally add extra cycles - Githubissues

clydeshaffer / GameTankEmulator

An emulator for the GameTank, a real physical hardware game console I've built

MIT License

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Conditionally add extra cycles #45

Closed nickgirardo closed 2 weeks ago

nickgirardo commented 2 weeks ago

This pr is a simplified version of #43 based off a suggestion from @clydeshaffer

This pr adds extra cycles to the following cases:

ADC SBC in decimal mode
Jumps when taken
A further additional cycle when the taken jump is across a page boundary
Calculating instructions in addressing modes absolute indexed by x or y and indirect indexed by y if the calculated address crosses a page boundary

This should improve cycle accuracy of the emulator