giomba/vic20-xmas-demo
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Add picture of a Christmas tree.

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giomba 2022-12-04 21:54:19 +01:00
parent 3126b6d728
commit e907759643
2 changed files with 44 additions and 0 deletions
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res/tree.bin Normal file
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44
src/main.asm
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@ -171,13 +171,53 @@ loading_feedback SUBROUTINE
lda #$f2 lda #$f2
sta $325 sta $325
; wait for SPACE
.chrin: .chrin:
jsr $ffe4 jsr $ffe4
cmp #$20 cmp #$20
bne .chrin bne .chrin
jsr copytree
rts rts
; draws a Christmas tree shamelessly copied from another demo
copytree SUBROUTINE
lda #<tree_start
sta srcPointer
lda #>tree_start
sta srcPointer + 1
lda #$00
sta dstPointer
lda #$1e
sta dstPointer + 1
ldy #0
.loop:
lda (srcPointer),y
sta (dstPointer),y
inc srcPointer
bne .noinc1
inc srcPointer + 1
.noinc1:
inc dstPointer
bne .noinc2
inc dstPointer + 1
.noinc2:
lda srcPointer
cmp #<tree_end
bne .loop
lda srcPointer + 1
cmp #>tree_end
bne .loop
rts
message: message:
BYTE #$0d,#$0d,"PLEASE WAIT 20 SEC",#$0d,"I'M JUST",#$0d,"AN OLD COMPUTER",#$0d,#0 BYTE #$0d,#$0d,"PLEASE WAIT 20 SEC",#$0d,"I'M JUST",#$0d,"AN OLD COMPUTER",#$0d,#0
start_button_message: start_button_message:
@ -190,6 +230,10 @@ demo_end:
DEMO_LEN SET demo_end - demo_start DEMO_LEN SET demo_end - demo_start
ECHO DEMO_LEN ECHO DEMO_LEN
tree_start:
.incbin "res/tree.bin"
tree_end:
. = $bff9 . = $bff9
jmp loading_feedback jmp loading_feedback
. = $bffc . = $bffc