Add picture of a Christmas tree.

src/main.asm

@@ -171,13 +171,53 @@ loading_feedback SUBROUTINE
     lda #$f2
     sta $325
 
+    ; wait for SPACE
 .chrin:
     jsr $ffe4
     cmp #$20
     bne .chrin
 
+    jsr copytree
+
     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:
     BYTE #$0d,#$0d,"PLEASE WAIT 20 SEC",#$0d,"I'M JUST",#$0d,"AN OLD COMPUTER",#$0d,#0
 start_button_message:
@@ -190,6 +230,10 @@ demo_end:
 DEMO_LEN SET demo_end - demo_start
     ECHO DEMO_LEN
 
+tree_start:
+    .incbin "res/tree.bin"
+tree_end:
+
 . = $bff9
     jmp loading_feedback
 . = $bffc