how to use $7CD vdp write

Door rendomizer

Rookie (27)

afbeelding van rendomizer

27-10-2018, 15:36

I would like to redefine "A" with $ 7CD call but I can not do it. can you enlighten me please

org $d000
         push hl
boucle:         
         ld a,$0a
         ld b,64
         add a,b
         ld h,a
         ld l,$08
         ld a,255
          call $07CD
           
           
fin:
          pop hl
          ret
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