r0 := $02 r0l := $02 r0h := $03 vera_data0 := $9f23 .export _fill_vera .import popa .segment "CODE" _fill_vera: sta vera_fill_data jsr popa sta max lda max cmp #0 beq @end @fill: ldx #0 lda vera_fill_data @loop: sta vera_data0 inx cpx max bne @loop @end: rts .segment "BSS" max: .res 1 vera_fill_data: .res 1