Posted By
George
on 2013-01-10
18:32:54
 |  Re: Speed up Routine for Placing A Bitmap
Hi Chicken,
i solved the issue in assembly. It was my second try ever in this language, but i am getting slowly into it. The Basic-Try was helpful, because i know the theoretical-part in TED-graphics now.
I solved the positioning of the crosshair in assembly (crappy code, but it works). Extremly fast.
The problem now is, how to read out the keys when you press Upper-Left, Upper-Right,Down-Left, Down-right:
My code so far:
LDA #$BF
STA $FD30
STA $FF08
LDA $FF08
AND #$08 ; Query keyboard for "Right"
BEQ weiter_dr
LDA #$BF
STA $FD30
STA $FF08
LDA $FF08
AND #$01 ; Query keyboard for "left"
BEQ weiter_dl
LDA #$DF
STA $FD30
STA $FF08
LDA $FF08
AND #$08 ; Query keyboard for "up"
BEQ weiter_du
LDA #$DF
STA $FD30
STA $FF08
LDA $FF08
AND #$01 ; Query keyboard for "down"
BEQ weiter_dd
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