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xmas2019: more vapor lock (clearing)

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This commit is contained in:
Vince Weaver 2019-12-19 11:16:11 -05:00
parent d1da78cfc0
commit 8be4fff5f3
1 changed files with 25 additions and 3 deletions
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28
xmas_2019/xmas2019.s
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@ -1,4 +1,9 @@
; Display awesome tree
; XMAS2019 Demo
; + Display awesome tree
; + Starfield
; + Music
; + Snow
; by deater (Vince Weaver) <vince@deater.net>
@ -148,7 +153,6 @@ vblank_start:
; 4550 cycles - 3 = 4547
; Try X=13 Y=64 cycles=4545 R2
; nop
@ -169,7 +173,7 @@ vblank_start:
;==========================================================
; clear 10-30 on lines 8-38
; 4+(80+5)*20+5-1 = 1708 cycles
; 4+(80+5)*20-1 = 1703 cycles
clear_lores:
lda #$0 ; 2
@ -203,6 +207,24 @@ clear_lores_loop:
; -1
; 4550 cycles - 3 -1703 = 2844
; Try X=12 Y=43 cycles=2839R5
nop
lda COLOR
ldy #43 ; 2
dloop1: ldx #12 ; 2
dloop2: dex ; 2
bne dloop2 ; 2nt/3
dey ; 2
bne dloop1 ; 2nt/3
jmp display_loop
;============================================================
;============================================================
; move line