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fireworks: mess with page splitting some more

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mostly have it figured out
This commit is contained in:
Vince Weaver 2018-09-12 12:53:06 -04:00
parent 743f631f21
commit 8872df2c71
1 changed files with 50 additions and 12 deletions
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62
fireworks/fireworks.s
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@ -182,22 +182,29 @@ display_loop:
; HIRES PAGE0 for the top 152 lines
;===================================
; 152 * 65 = 9880 - 12 = 9868
; 152 * 65 = 9880
; -8 for HIRES/PAGE0 at top
; -5 for LORES+ldy+br fallthrough at bottom
; 9867
bit HIRES ; 4
bit PAGE0 ; 4
;===========
; 8
; Try X=22 Y=85 cycles=9861 R6
; Try X=81 Y=24 cycles=9865 R3
lda DRAW_PAGE ; nop ; 3
lda DRAW_PAGE ; nop ; 3
lda DRAW_PAGE ; 3
ldy #24 ; 2
hgloop1:ldx #81 ; 2
ldy #85 ; 2
hgloop1:ldx #22 ; 2
hgloop2:dex ; 2
bne hgloop2 ; 2nt/3
dey ; 2
bne hgloop1 ; 2nt/3
bit LORES ; 4
;====================================================
@ -205,12 +212,7 @@ hgloop2:dex ; 2
;====================================================
bit LORES ; 4
ldy #20 ; *2=40 lines ; 2
;============
; 6
ldy #12 ; *2=24 lines ; 2
; we set PAGE0 (4) then want to NOP (61) for a total of 65
bouter_loop:
@ -239,12 +241,48 @@ bpage1_loop:
; 5 to make 65
;=========================================================
; LORES PAGE0/PAGE1+TEXT alternating for the next 16 lines
;=========================================================
ldy #8 ; *2=16 lines ; 2
; we set PAGE0 (4) then want to NOP (61) for a total of 65
couter_loop:
bit PAGE0 ; 4
ldx #12 ; 65 cycles with PAGE0 ; 2
cpage0_loop: ; delay 61+bit
dex ; 2
bne cpage0_loop ; 2/3
;=============
; 6+(12*5)-1=65
; we set PAGE1 (4) as well as dey (2) and bne (3) then nop (55)
;
bit PAGE1 ; 4
ldx #11 ; 65 cycles with PAGE1 ; 2
cpage1_loop:
dex ; 2
bne cpage1_loop ; 2/3
;=============
; 6+(11*5)-1=60
dey ; 2
bne couter_loop ; 2/3
;==============
; 5 to make 65
;======================================================
; We have 4550 cycles in the vblank, use them wisely
;======================================================
; 4550
; +1 fallthrough
; -2 ldy at entry
; -2 for ldy in previous
; -35 call through jumptable
; -7 keyboard
; -3 jmp