65816.js/TODO

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CPU:
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- Decrementing 0 with the DEC/DEY/DEX operations should result in 0xff(8-bit)
or 0xffff(16-bit).
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- Stack operations and stack support in general
- Subroutines
- Comparisons and branching
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- LDY and LDX must behave properly in 8-bit mode when x bit in the p status
register is set to one
- Accumulator must behave properly when in 8-bit mode
- Emulation mode support in general.
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- Have each operation return the number of cycles used by the execute function.
- Implement the rest of the missing operations.
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Memory:
- Banks
- ROM protection
- Memory mapped I/O
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Display:
- Using the html page included provide a nice interface for using the cpu
emulator and provide many features helpful for debugging