Er, whoops. That doesn't quite work as I wrote it. This will work:
lda BallHeight
dcp BallYPosition
sbc BallAdjuster
sta ENABL ;+14
Where BallAdjuster = BallHeight - 2
I forgot which way the carry flag was flipped after the dcp.
-bob
-----Original Message-----
From: Bob Montgomery
Sent: Friday, February 25, 2005 8:18 AM
To: stella@xxxxxxxxxxxxxxxxxx
Subject: [stella] Fastest missile/ball draw
The fastest way to draw a missile or ball (of variable height) that I have come up with is this:
lda BallHeight
dcp BallYPosition
sbc BallHeight
sta ENABL ;+14
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