Hi!
Well, I've improved the TIA emulation is Stella quite a bit now. The
main thing that remains is to experiment on a real 2600 to see what
happens when HM?? registers are changed near an HMOVE. Looks like
GI Joe uses this alot to draw the snake.
Now, I'd like to spend a week or two on improving the Supercharger
support. So I thought it would be good to revisit an almost year
old discussion about Supercharger internals :-)
I reviewed all of the various posting about the Supercharager today
and one question I'd like to ask is what instruction sequences are
people using to write to Supercharger RAM. I believe the following
work and I know the instructions are not that important the key is
the addressing modes:
lda $f000,x
nop
sta $ff00
lda $f000,x
sta ($80),y
Has anyone used:
ldx #$01
lda $f000,y
sta ($80,x)
or
ldx #$00
lda $f000,y
sta ($80,x)
I'm wondering if both of these work or if just the last one. Ahh. Time
for some more experiments :-)
Later,
Brad
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Bradford W. Mott (bwmott@xxxxxxx) Computer Science Department
http://www4.ncsu.edu/~bwmott/www North Carolina State University
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