This is my first attempt with DMA. I want to load 16 colors into the palette, starting at color 80, but I can't get it to work. It does absolutly nothing... Can anyone tell me what's wrong with my code?
Code
pha
php
lda #$80 ;color nr to start
sta $2121
stz $4300 ;normal dma
lda #$22 ;destination, cgram write
sta $4301
rep #$20 ;16bit
lda pal ;source adress
sta $4302
sep #$20 ;8bit
lda #$1a ;source bank
sta $4304
rep #$20 ;16bit
lda #$0032 ;ammount of bytes to transfer
sta $4305
sep #$20 ;8bit
lda #$01 ;use channel 0
sta $420b
plp
pla
rts
pal:
dw $FFFF, $FFFF, $FFFF, $FFFF, $FFFF, $FFFF, $FFFF, $FFFF, $FFFF, $FFFF, $FFFF, $FFFF, $FFFF, $FFFF, $FFFF, $FFFF,
Last edited on 2007-09-09 10:34:26 AM by ghettoyouth.
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