mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-12-29 00:31:52 +00:00
116 lines
1.8 KiB
ArmAsm
116 lines
1.8 KiB
ArmAsm
|
;=====================================================================
|
||
|
|
;= ROUTINES
|
||
|
|
;=====================================================================
|
||
|
|
|
||
|
|
|
||
|
|
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_screens_notext:
|
||
|
|
;===================================
|
||
|
|
; Clear top/bottom of page 0
|
||
|
|
;===================================
|
||
|
|
|
||
|
|
lda #$0
|
||
|
|
sta DRAW_PAGE
|
||
|
|
jsr clear_top
|
||
|
|
lda #$0
|
||
|
|
jsr clear_bottom_a
|
||
|
|
|
||
|
|
;===================================
|
||
|
|
; Clear top/bottom of page 1
|
||
|
|
;===================================
|
||
|
|
|
||
|
|
lda #$4
|
||
|
|
sta DRAW_PAGE
|
||
|
|
jsr clear_top
|
||
|
|
lda #$0
|
||
|
|
jsr clear_bottom_a
|
||
|
|
|
||
|
|
rts
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
;=============================
|
||
|
|
; clear_top
|
||
|
|
;=============================
|
||
|
|
; takes 2+10+ (24+703 )*20 +6
|
||
|
|
; 14,558 cycles(?) 15ms, 70Hz
|
||
|
|
clear_top:
|
||
|
|
lda #$00 ; 2
|
||
|
|
|
||
|
|
;=============================
|
||
|
|
; clear_top_a
|
||
|
|
;=============================
|
||
|
|
clear_top_a:
|
||
|
|
|
||
|
|
sta COLOR ; 3
|
||
|
|
|
||
|
|
; HLIN Y, V2 AT A
|
||
|
|
|
||
|
|
lda #39 ; 2
|
||
|
|
sta V2 ; 3
|
||
|
|
|
||
|
|
lda #0 ; 2
|
||
|
|
|
||
|
|
clear_top_loop:
|
||
|
|
ldy #0 ; 2
|
||
|
|
pha ; 3
|
||
|
|
|
||
|
|
jsr hlin_double ; 6+
|
||
|
|
|
||
|
|
pla ; 4
|
||
|
|
clc ; 2
|
||
|
|
adc #$2 ; 2
|
||
|
|
cmp #40 ; 2
|
||
|
|
bne clear_top_loop ; 2nt/3
|
||
|
|
|
||
|
|
rts ; 6
|
||
|
|
|
||
|
|
;=============================
|
||
|
|
; clear_bottom
|
||
|
|
;=============================
|
||
|
|
clear_bottom:
|
||
|
|
lda #$a0 ; NORMAL space
|
||
|
|
|
||
|
|
clear_bottom_a:
|
||
|
|
|
||
|
|
sta COLOR
|
||
|
|
|
||
|
|
lda #40
|
||
|
|
sta V2
|
||
|
|
|
||
|
|
clear_bottom_loop:
|
||
|
|
ldy #0
|
||
|
|
pha
|
||
|
|
|
||
|
|
jsr hlin_double
|
||
|
|
|
||
|
|
pla
|
||
|
|
clc
|
||
|
|
adc #$2
|
||
|
|
cmp #48
|
||
|
|
bne clear_bottom_loop
|
||
|
|
|
||
|
|
rts
|
||
|
|
|