10 *=$C000 20 SEI 30 LDA $D020 40 STA COLOUR1 50 LDA $D021 60 STA COLOUR2 70 LDA #$7F 80 STA $DC0D 90 LDA #IRQ 120 STA $0315 130 LDA #$32 140 STA $D012 150 LDA #$1B 160 STA $D011 170 LDA #$01 180 STA $D01A 190 LDA $DC0D 200 CLI 210 RTS 220 IRQ ; 230 LDA $D012 240 BMI BOTTOM 250 LDA #$F9 260 STA $D012 270 LDA COLOUR2 280 LDX #$01 290 LOOP1 DEX 300 BNE LOOP1 310 STA $D020 320 STA $D021 330 LDA #$01 340 STA $D019 350 JMP $EA81 360 BOTTOM LDA #$32 370 STA $D012 380 LDA COLOUR1 390 LDX #$0D 400 LOOP2 DEX 410 BNE LOOP2 420 STA $D020 430 STA $D021 440 LDA #$01 450 STA $D019 460 JMP $EA31 470 COLOUR1 BYT 0 480 COLOUR2 BYT 0