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midline: urgh

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This commit is contained in:
Vince Weaver 2023-05-18 12:15:54 -04:00
parent 3ec17c1bde
commit d5db7dc892
1 changed files with 20 additions and 23 deletions
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43
vaporlock/demo/midline.s
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@ -71,35 +71,19 @@ lp17029:
; do the cycle counting ; do the cycle counting
;============================== ;==============================
blog: cycle_start:
vblank_start:
;======================================
; wait 4550 for VBLANK
;======================================
; 2
ldx #4 ; 2
jsr wait_x_x_1k ; 4000
ldy #54 ; 2
jsr wait_y_x_10 ; 540
; 4543
inc FRAME ; 5
; 4548 (-2)
; nop ; 2
; 0
; 192 + 70 (vblank) = 262 ; 192 + 70 (vblank) = 262
; if 42 high, then day 220 on, 42 off ; if 42 high, then day 220 on, 42 off
; how start in middle? ; how start in middle?
; .byte $A5
lda $EA ; nop3 ; 3 ; 1
top_smc: top_smc:
ldx #4 ; 2 ldx #68 ; 2
nop
bne top8 ; bra ; 3/2 bne top8 ; bra ; 3/2
@ -198,8 +182,21 @@ bottom_8:
bcc bottom_loop ; 3/2 bcc bottom_loop ; 3/2
; -1 ; -1
jmp vblank_start
; 2 ;======================================
; wait 4550 for VBLANK
;======================================
; -1 from before
vblank_start:
ldx #4 ; 2
jsr wait_x_x_1k ; 4000
ldy #54 ; 2
jsr wait_y_x_10 ; 540
; 4543
inc FRAME ; 5
; 4548
jmp cycle_start
; +1
delay_16_setgr: delay_16_setgr:
bit SET_GR bit SET_GR