VSS .8 debug (or, THANK YOU DAN B)

[+Cafeman]

http://cafeman.www9.50megs.com/atari/5200d...fiArchives.html

 

I spent hours trying to find what was going awry with a routine -- at this link, check out the feb 21, 2002 entry, it explains it.

 

Thanks to Dan's VSS .8 debug mode, I found it! It was driving me crazy!

 

As a side comment -- I have noticed where in statements like these:

 

lda #$counter ;value of F

clc

sbc #$07

bcc NewLogic

....

 

where the bcc does NOT work like I expect it to. In other words, it didn't branch to NewLogic even though the value of the accumulator didn't cross 0 to FF. Any explanations?

 

Thanks again Dan - that's why I use the good old vSS for development!

 

[ 02-21-2002: Message edited by: Cafeman ]

[calamari]

Before a subtraction, set the carry.. before an add, clear the carry.

 

calamari

[+Cafeman]

heh. Cala just told me this over at #RGVC -- what a revelation! I'm so glad I understand that now, I wasted so much time!

 

I was about to answer my own question..