giomba/vic20-xmas-demo
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Load BASIC program correctly. Enter RUN and it works!

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giomba 2022-12-04 18:54:40 +01:00
parent 313b5a20ab
commit cbbcf2ca64
1 changed files with 14 additions and 0 deletions
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14
src/main.asm
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@ -30,6 +30,9 @@ coldstart SUBROUTINE
jsr $e404 ; print startup message and initialize memory pointers jsr $e404 ; print startup message and initialize memory pointers
ldx #$fb ; value for stack start ldx #$fb ; value for stack start
txs ; set stack pointer txs ; set stack pointer
lda #$76 ; set "READY." pointer
ldy #$c3
jsr $cb1e ; print null terminated string
lda #$80 ; set for control messages only lda #$80 ; set for control messages only
jsr $ff90 ; control kernal messages jsr $ff90 ; control kernal messages
@ -37,6 +40,17 @@ coldstart SUBROUTINE
jsr copycode jsr copycode
.almost_ready: .almost_ready:
; set current BASIC line number
lda #$ff
sta $3a
lda #0
sta $3b
; set start of variables
lda #$ff
sta $2d
lda #$15
sta $2e
; setup fake chrin ; setup fake chrin
; sei ; sei