For some reason, comparisons (and math in general) have
always been my downfall in 6502/6507 land, and now I just
realized I've been doing unsiged comparisons, and the signed
comparison I need is going to be even tougher.
I'm using a 6502 emulator to work this out. I think the
follow would generally work if I wasn't dealing w/ any negative values:
(var is the value, set to MIN or MAX if it exceeds that value)
*= $600
var = $0000
MAX = 3
MIN = -3
LDA #-4 ; initial value
STA var
LDA #MAX
cmp var
BCS DoneSetToMax
LDA #MAX
STA var
DoneSetToMax
lda #MIN
clc
cmp var
bcs DoneSetToMin
LDA #MIN
STA var
DoneSetToMin
BRK
In case people are wondering, I'm finally (a week from
my self-imposedish PC5 deadline) getting around to using "fractional"
positioning for the ball vertical speed. Initial results were
fairly promising, with the ball vert. being the speed of the player
who hit it, but I was getting some overflowish problem or
something where the ball was wrapping past the floor to
and coming out of the ceiling, which I think was partially
tied in with it moving too fast.
Thanks for any help w/ the signed comparison!
-Kirk
--
KirkIsrael@xxxxxxxxxxxxx http://kisrael.com
"If you feel it, but it isn't right, don't do it and don't
believe it. We can be better than natural -- we're human."--Penn Jillette
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