mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-12-27 02:31:00 +00:00
45 lines
910 B
ArmAsm
45 lines
910 B
ArmAsm
;==================================
|
|
; HLINE
|
|
;==================================
|
|
; Color in A
|
|
; Y has which line
|
|
; takes 435 cycles
|
|
hline:
|
|
pha ; 3
|
|
ldx gr_offsets,y ; 4+
|
|
stx hline_loop+1 ; self-modify code ; 4
|
|
lda gr_offsets+1,y ; 4+
|
|
clc ; 2
|
|
adc DRAW_PAGE ; 3
|
|
sta hline_loop+2 ; self-modify code ; 4
|
|
pla ; 4
|
|
ldx #39 ; 2
|
|
;===========
|
|
; 30
|
|
hline_loop:
|
|
sta $5d0,X ; 38 ; 5
|
|
dex ; 2
|
|
bpl hline_loop ; 2nt/3
|
|
;===========
|
|
; 40*(10)=400
|
|
|
|
; -1
|
|
rts ; 6
|
|
|
|
;==========================
|
|
; Clear gr screen
|
|
;==========================
|
|
; Color in A, Clears 0 to and including Y
|
|
; clear_gr: takes 2+(48/2)*(6+435+7)+5 = 10759
|
|
; cpl: takes (Y/2)*(6+435+7)+5 = ?
|
|
clear_gr:
|
|
ldy #46 ; 2
|
|
clear_page_loop:
|
|
jsr hline ; 6+435
|
|
dey ; 2
|
|
dey ; 2
|
|
bpl clear_page_loop ; 2/3
|
|
rts ; 6
|
|
|
|
|