I came up with some 6502 assembly tricks:
- make N and Z flags reflect A (no side effects): AND #$FF (used in Excitebike; alternatives: ORA #0 or EOR #0)
- make N and Z flags reflect X (no side effects*): INX & DEX (or for Y: INY & DEY)

*If your interrupt routines don't access the value of X besides preserving it.

#6502assembly #6502_assembly

I know I should have made this a while ago, but here is a new blog post on my experiences learning 6502 Assembly to make an NES rom:

https://wildrose.space/blog/NESDev/

#NESDev #mos6502 #assembly #6502_assembly