On Tuesday, July 16, 2002, at 10:37 PM, Chris Wilkson wrote:
This is a good test. But see above. Try replacing BNE with BMI and
it should work. There's also the possibility that you aren't disabling
the latches. I'm fuzzy on those details...I'd have to look them up.
But I'm sure someone else can help.
From what Eckhard told me just a few days/weeks ago, you'd be best
served by (un)latching VBLANK (whatever hitting D6 is) every frame
if you have a simple kernel. It would appear that your BNE was
what what creating what you described as...
it doesn't seem to matter if I
LDA #%01000000
before
STA VBLANK
instead of just letting it be #0
So I guess I don't get the implication of the
whole latch thing...
Once you've substituted BMI, try putting 1 back into D6 of VBLANK
just like you'd done before. I bet that works. I think more
recent versions of my code have an okay joystick read routine,
including the buttons.
Eckhard further explained that the latch bit can get more
complicated if your kernel only checks for button presses every,
say, third screen draw (as I understood him). If you throw down
the latch, you can preserve the button press until you deal with it.
But I'm not doing anything that fancy, and am not *quite* sure how
that's helpful yet. Insert "young grasshopper" reference (meaning
me in this case).
Hope that helps,
Ruffin Bailey
http://myfreakinname.blogspot.com
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