loadmulticolorimage.asm

    lda colora+0
    sta $d020
    lda colora+1
    sta $d021

    lda #$00
    sta $d020
    sta $d021

    // multicolor gfx mode
    lda #$3b
    sta $d011
    lda #$18
    sta $d016

    // screen ram ($0400), bitmap $2000
//Bits #1-#3: In text mode, pointer to character memory (bits #11-#13), relative to VIC bank, memory address $DD00. Values:
//
//%000, 0: $0000-$07FF, 0-2047.
//%100, 4: $2000-$27FF, 8192-10239.

// Bits #4-#7: Pointer to screen memory (bits #10-#13), relative to VIC bank, memory address $DD00. Values:
// %0000, 0: $0000-$03FF, 0-1023.
// %0001, 1: $0400-$07FF, 1024-2047.
    lda #$18
    sta $d018


    ldx #$00
copyimage:
    .for (var i = 0; i < 4; i++) {
        lda colora+2+i*256, x
        sta $0400+i*256, x

        lda colorb+i*256, x
        sta $d800+i*256, x
    }
    inx
    bne copyimage

* = $2000 "kuva"
gfx:
.import source "testikuva.txt"