194 lines
3.6 KiB
ArmAsm
194 lines
3.6 KiB
ArmAsm
clear_screens:
|
|
;===================================
|
|
; Clear top/bottom of page 0
|
|
;===================================
|
|
|
|
lda #$0
|
|
sta DRAW_PAGE
|
|
jsr clear_top
|
|
jsr clear_bottom
|
|
|
|
;===================================
|
|
; Clear top/bottom of page 1
|
|
;===================================
|
|
|
|
lda #$4
|
|
sta DRAW_PAGE
|
|
jsr clear_top
|
|
jsr clear_bottom
|
|
|
|
rts
|
|
|
|
clear_bottoms:
|
|
;===================================
|
|
; Clear bottom of page 0
|
|
;===================================
|
|
|
|
lda #$0
|
|
sta DRAW_PAGE
|
|
jsr clear_bottom
|
|
|
|
;===================================
|
|
; Clear bottom of page 1
|
|
;===================================
|
|
|
|
lda #$4
|
|
sta DRAW_PAGE
|
|
jsr clear_bottom
|
|
|
|
rts
|
|
|
|
|
|
|
|
;=========================================================
|
|
; clear_top
|
|
;=========================================================
|
|
; clear DRAW_PAGE
|
|
; original = 14,558 cycles(?) 15ms, 70Hz
|
|
; OPTIMIZED MAX (page0,48rows): 45*120+4+6 = 5410 = 5.4ms 185Hz
|
|
; (pageX,40rows): 50*120+4+6 = 6010 = 6.0ms 166Hz
|
|
; 50*120+4+6+37 = 6055 = 6.0ms 166Hz
|
|
clear_top:
|
|
lda #0 ; 2
|
|
clear_top_a:
|
|
sta COLOR ; 3
|
|
clc ; 2
|
|
lda DRAW_PAGE ; 3
|
|
|
|
adc #4 ; 2
|
|
sta __ctf+2 ; 3
|
|
sta __ctf+5 ; 3
|
|
adc #1 ; 2
|
|
sta __ctf+8 ; 3
|
|
sta __ctf+11 ; 3
|
|
adc #1 ; 2
|
|
sta __ctf2+2 ; 3
|
|
sta __ctf2+5 ; 3
|
|
adc #1 ; 2
|
|
sta __ctf2+8 ; 3
|
|
sta __ctf2+11 ; 3
|
|
|
|
|
|
ldy #120 ; 2
|
|
lda COLOR ; 3
|
|
clear_top_fast_loop:
|
|
__ctf:
|
|
sta $400,Y ; 5
|
|
sta $480,Y ; 5
|
|
sta $500,Y ; 5
|
|
sta $580,Y ; 5
|
|
|
|
cpy #80 ; 2
|
|
bpl no_draw_bottom ; 2nt/3
|
|
__ctf2:
|
|
sta $600,Y ; 5
|
|
sta $680,Y ; 5
|
|
sta $700,Y ; 5
|
|
sta $780,Y ; 5
|
|
no_draw_bottom:
|
|
|
|
dey ; 2
|
|
bpl clear_top_fast_loop ; 2nt/3
|
|
|
|
rts ; 6
|
|
|
|
|
|
|
|
|
|
;=========================================================
|
|
; clear_bottom
|
|
;=========================================================
|
|
; clear bottom of draw page
|
|
|
|
clear_bottom:
|
|
clc ; 2
|
|
lda DRAW_PAGE ; 3
|
|
|
|
adc #6 ; 2
|
|
sta __cbf2+2 ; 3
|
|
sta __cbf2+5 ; 3
|
|
adc #1 ; 2
|
|
sta __cbf2+8 ; 3
|
|
sta __cbf2+11 ; 3
|
|
|
|
|
|
ldy #120 ; 2
|
|
lda #$a0 ; Normal Space ; 2
|
|
clear_bottom_fast_loop:
|
|
__cbf2:
|
|
sta $600,Y ; 5
|
|
sta $680,Y ; 5
|
|
sta $700,Y ; 5
|
|
sta $780,Y ; 5
|
|
|
|
dey ; 2
|
|
cpy #80 ; 2
|
|
bpl clear_bottom_fast_loop ; 2nt/3
|
|
|
|
rts ; 6
|
|
|
|
|
|
clear_screens_notext:
|
|
;===================================
|
|
; Clear top/bottom of page 0
|
|
;===================================
|
|
|
|
lda #$0
|
|
sta DRAW_PAGE
|
|
jsr clear_all
|
|
|
|
;===================================
|
|
; Clear top/bottom of page 1
|
|
;===================================
|
|
|
|
lda #$4
|
|
sta DRAW_PAGE
|
|
jsr clear_all
|
|
|
|
rts
|
|
|
|
|
|
;=========================================================
|
|
; clear_all
|
|
;=========================================================
|
|
; clear 48 rows
|
|
; clear color: clear_all_color+1
|
|
|
|
clear_all:
|
|
clc ; 2
|
|
lda DRAW_PAGE ; 3
|
|
|
|
adc #4 ; 2
|
|
sta __caf+2 ; 3
|
|
sta __caf+5 ; 3
|
|
adc #1 ; 2
|
|
sta __caf+8 ; 3
|
|
sta __caf+11 ; 3
|
|
adc #1 ; 2
|
|
sta __caf2+2 ; 3
|
|
sta __caf2+5 ; 3
|
|
adc #1 ; 2
|
|
sta __caf2+8 ; 3
|
|
sta __caf2+11 ; 3
|
|
|
|
|
|
ldy #120 ; 2
|
|
clear_all_color:
|
|
lda #0 ; 2
|
|
clear_all_fast_loop:
|
|
__caf:
|
|
sta $400,Y ; 5
|
|
sta $480,Y ; 5
|
|
sta $500,Y ; 5
|
|
sta $580,Y ; 5
|
|
__caf2:
|
|
sta $600,Y ; 5
|
|
sta $680,Y ; 5
|
|
sta $700,Y ; 5
|
|
sta $780,Y ; 5
|
|
|
|
dey ; 2
|
|
bpl clear_all_fast_loop ; 2nt/3
|
|
|
|
rts ; 6
|