On Sun, 14 Jul 2002 11:56:07 -0700, you wrote:
>Here is a joystick read routine that is not so efficient, it follows the
>standard programming technique one would use in something like C++ or basic:
Except that that code (both the 'usual' and your version) can't handle two
directions at once (like up-left.) You need to set up something like
this:
LDA SWCHA
ASL
BCS notright
;do stuff for right without changing A
notright ASL
BCS notleft
;do stuff for left without changing A
notleft ASL
and so on. Alternatively, you could do
LDA SWCHA
STA TempVar
ASL TempVar
BCS notright
...
notright ASL TempVar
and so on.
(yes, optimiziation gurus, I realize it could be LDA SWCHA | ASL |
STA TempVar | BCS . I'm going for clarity :) )
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