mirror of
https://github.com/deater/dos33fsprogs.git
synced 2025-01-20 21:30:03 +00:00
67 lines
736 B
ArmAsm
67 lines
736 B
ArmAsm
;==================================
|
|
; do very simple horizontal scroll
|
|
;==================================
|
|
; screens to pan in $2000/$4000 to left
|
|
|
|
|
|
horiz_pan:
|
|
|
|
pan_loop:
|
|
|
|
lda #0
|
|
sta COUNT
|
|
|
|
pan_outer_outer_loop:
|
|
|
|
ldx #191
|
|
pan_outer_loop:
|
|
|
|
lda hposn_high,X
|
|
sta pil_smc1+2
|
|
sta pil_smc2+2
|
|
sta pil_smc4+2
|
|
eor #$60
|
|
sta pil_smc3+2
|
|
|
|
lda hposn_low,X
|
|
sta pil_smc2+1
|
|
sta pil_smc4+1
|
|
|
|
sta pil_smc1+1
|
|
inc pil_smc1+1
|
|
clc
|
|
adc COUNT
|
|
sta pil_smc3+1
|
|
|
|
|
|
ldy #0
|
|
pan_inner_loop:
|
|
|
|
pil_smc1:
|
|
lda $2000+1,Y
|
|
pil_smc2:
|
|
sta $2000,Y
|
|
|
|
iny
|
|
cpy #39
|
|
bne pan_inner_loop
|
|
|
|
pil_smc3:
|
|
lda $4000
|
|
pil_smc4:
|
|
sta $2000,Y
|
|
|
|
dex
|
|
cpx #$ff
|
|
bne pan_outer_loop
|
|
|
|
; jsr wait_until_keypress
|
|
|
|
inc COUNT
|
|
lda COUNT
|
|
cmp #39
|
|
|
|
bne pan_outer_outer_loop
|
|
|
|
rts
|