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space_bars: more splitting the timing

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This commit is contained in:
Vince Weaver 2018-10-06 20:46:06 -04:00
parent 757f9d9c3d
commit 7862e051a1
1 changed files with 23 additions and 6 deletions
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29
space_bars/game.s
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@ -186,28 +186,45 @@ sb_text_loop:
sb_hgr_loop: sb_hgr_loop:
; delay 184*65 = 11960 ; delay 40*65 = 2600
; -2 ; -2
; +1 ; +1
; -8 ; -8
;========================= ;=========================
; 11951 ; 2591
bit SET_GR ; 4 bit SET_GR ; 4
bit HIRES ; 4 bit HIRES ; 4
; Try X=22 Y=103 cycles=11949 R2 ; Try X=1 Y=235 cycles=2586 R5
nop nop ; 2
lda $0 ; 3
ldy #103 ; 2 ldy #235 ; 2
sbloopC:ldx #22 ; 2 sbloopC:ldx #1 ; 2
sbloopD:dex ; 2 sbloopD:dex ; 2
bne sbloopD ; 2nt/3 bne sbloopD ; 2nt/3
dey ; 2 dey ; 2
bne sbloopC ; 2nt/3 bne sbloopC ; 2nt/3
sb_mixed_loop:
; delay 144*65 = 9360
; Try X=37 Y=49 cycles=9360
ldy #49 ; 2
sbloopE:ldx #37 ; 2
sbloopF:dex ; 2
bne sbloopF ; 2nt/3
dey ; 2
bne sbloopE ; 2nt/3
;====================================================== ;======================================================
; We have 4550 cycles in the vblank, use them wisely ; We have 4550 cycles in the vblank, use them wisely
;====================================================== ;======================================================