A89: Trouble with grayscale graphics
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A89: Trouble with grayscale graphics
Hi everyone. I'm new to TI-89 programming and would like to start a
project. I was hoping someone could help me with a problem I am having.
This program is supposed to display a 16 pixel line in the upper
left-hand corner of the screen. Half of it should be black, the other
half gray. What I actually get is a 4 pixel long(I think) black line
that is about 4 pixels to the right of the upper-left hand corner. I
also get a whole lot of garbage(random lines, old screens, etc.)
displayed in gray. The program was compiled with plusshell. By the
way, all I did to install plusshell was transfer the libraries(seems
to work for tetris, nibbles, etc.). Any help would be appreciated.
include "tios.h"
include "gray4lib.h"
include "util.h"
xdef _ti89
xdef _main
_main:
jsr util::zap_screen
jsr gray4lib::on
move.l gray4lib::plane0,a0
move.l gray4lib::plane1,a1
move.b #7,(a0)+
move.b #7,(a0)
move.b #7,(a1)
jsr util::idle_loop
jsr gray4lib::off
rts
end
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