Thank you!

I just browsed through the Liechty & Eyes manual, and it looks awesome! Just what I was looking for. But I would also like to have a physical book as well, so I can study it when away from the computer. Looks like I can pick up both of those books pretty cheap. Thanks GARTH and BillO! :D

Hello :)

My name is Josh and I am an NES Tetris enthusiast. I am actually pretty good at the game, but I want to be a "Master". What I mean by that, is there are about a dozen or so people who are certainly better than me (probably more than that but who knows), and they all met up a couple years ...

Thank you. I can't express how relieved I am to have it figured out now.

#$01 ;; 0000 0001
#$03 ;; 0000 0011
;;result 0000 0001

#$04 ;; 0000 0100
#$03 ;; 0000 0011
;; result 0000 0000




so in this scenario, the branch is taken:

$89B8:A5 B5 LDA $00B5 = #$01
$89BA:29 03 AND #$03
$89BC:D0 15 BNE $89D3



but here it is not:

$89B8:A5 B5 LDA $00B5 = #$04
$89BA:29 03 AND ...

I am desperately trying to figure out what the AND instruction means in 6502. I have found half a dozen or more resources online, but they all describe AND as being AND.

CMP means Compare Memory and Accumulator

That is a good definition, I know what CMP means now.

AND means AND

What kind of ...