I think the method I came up with is pretty reliable,
and doesn't worry so much about timing.
I'm using one variable, booleanSelectSwitchIsDown ,
and ultimately it toggles another boolean,
booleanGameIsTwoPlayers
LDA SWCHB
AND #%00000010 ;is game select?
BNE TitleSelectIsNotDownNow;if so proceed, if not branch
TitleSelectIsDownNow
LDA #1
STA booleanSelectSwitchIsDown ;record that's down now
JMP TitleDoneCheckingSelect ;and go onour way
TitleSelectIsNotDownNow
;so the switch is currently now up
LDA booleanSelectSwitchIsDown ;see if it was on before
BNE TitleSelectWasAlreadyOn
TitleSelectWasNotOn ; it wasn't on b4, it's still not on, no prob
JMP TitleDoneCheckingSelect
TitleSelectWasAlreadyOn ;it's not on now, they just let go
LDA #0
STA booleanSelectSwitchIsDown ;record that it's not on
LDA booleanGameIsTwoPlayers
EOR #%11111111 ;toggle the boolean for # of players
STA booleanGameIsTwoPlayers
TitleDoneCheckingSelect
Not super efficient, but it gets the job done.
I had to work up to this code by just changing the color
of the screen if select was down for each frame...
that proved to me that there was no funny business with
select, it can be read without too much hassle.
Another advantage of the current code is that the game
keeps playing until select is released, it doesn't go into
freaky no screen refresh land.
cheers,
k
--
KirkIsrael@xxxxxxxxxxxxx http://kisrael.com
"The real problem with having mind-controlled zombies as my servants is that
it's tough to get up a really sincere-sounding round of cheers when
I've come up with a plan I think is worth cheering." --Maximus, X-Factor
----------------------------------------------------------------------------------------------
Archives (includes files) at http://www.biglist.com/lists/stella/archives/
Unsub & more at http://www.biglist.com/lists/stella/
