Hello again everyone,
Ive been wondering about the BMI and BPL Routines. Ive been reading a 6502 book and i cant really grasp on how you can decrement to a "-" ie. -1 or +1. Ive finannly understood how the DEX works with BEQ starting out at 0 and DEXing once 11111111 (255) and then again and again till it reaches 0. But im wondering how it decrements and braches on a minus or a plus. Does it branch on a negative or postive value? Im wondering is it just a basic -1 or +1 for these routines or can you used ie. -5,-10,+9,+49. I hope youll can understand what im trying to get at.
Thanks in Advance,
EL
P.S. Visual Examples help alot alot. Thanks:)
Ive been wondering about the BMI and BPL Routines. Ive been reading a 6502 book and i cant really grasp on how you can decrement to a "-" ie. -1 or +1. Ive finannly understood how the DEX works with BEQ starting out at 0 and DEXing once 11111111 (255) and then again and again till it reaches 0. But im wondering how it decrements and braches on a minus or a plus. Does it branch on a negative or postive value? Im wondering is it just a basic -1 or +1 for these routines or can you used ie. -5,-10,+9,+49. I hope youll can understand what im trying to get at.
Thanks in Advance,
EL
P.S. Visual Examples help alot alot. Thanks:)