An Introduction to Programming C-64 Demos

I found this wonderful introduction to programming C-64 demos. Ah, those were the days 🙂

* = $0801

lda #$00
tax
tay
jsr $1000 ; initialize music

mainloop: lda $d012 ; load $d012
cmp #$80 ; is it equal to #$80?
bne mainloop ; if not, keep checking

inc $d020 ; inc border colour
jsr $1003 ; jump to music play routine
dec $d020 ; dec border colour
jmp mainloop ; keep looping

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