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better vaporlock

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This commit is contained in:
Vince Weaver 2018-10-31 00:26:57 -04:00
parent d6a86fed77
commit 993e72409a
1 changed files with 30 additions and 8 deletions
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38
space_bars/vapor_lock.s
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@ -48,15 +48,15 @@ vapor_lock:
lda #$dd
ldy #40
jsr clear_page_loop ; make top half grey2 $aa
jsr clear_page_loop ; make bottom half yellow $dd
lda #$aa
ldy #24
jsr clear_page_loop ; make top half grey2 $aa
jsr clear_page_loop ; make middle grey2 $aa
lda #$ee
ldy #10
jsr clear_page_loop ; make top half grey2 $aa
jsr clear_page_loop ; make top half aqua $ee
; set up a rainbow to aid in exact lock
@ -149,6 +149,11 @@ qloop:
; 6 17 28 39, clock at 40
;btt:
; jmp btt
; In theory near end of line 104
; now skip ahead 8 lines and read from the rainbow pattern we set
@ -158,15 +163,32 @@ qloop:
; we back off a few to make sure we're not in the horiz blank
; try to delay 510
lda #230 ; 2
jsr delay_a ; delay 25+230 = 255
; *NOTE* sometimes we end up going one (or rarely, two??) lines too far
; so instead try going 7 lines ahead, and if still dd then one more
lda #226 ; 2
jsr delay_a ; delay 25+226 = 251
; so single step until we get a rainbow color
; go to next line, -10
lda #28 ; 2
jsr delay_a ; delay 25+28 = 53
; total delay = 55
vl_try_again:
lda #29 ; 2
jsr delay_a ; delay 25+29 = 54
; total delay = 56
lda $C051 ; 4
cmp #$dd ; 2
beq vl_try_again ; 3
; -1
; now near end of line 112
;lda $0 ; nop to match old code ; 3
; nop ; nop to match old code ; 2
lda $C051 ; 4
;kbb: