dos33fsprogs/demos/applebot_demo/rle.s
Vince Weaver e0febd1a90 demos: more work
keep making git mistakes urgh
2021-01-05 22:52:10 -05:00

63 lines
1.2 KiB
ArmAsm

PLOT = $F800 ; plot, horiz=y, vert=A (A trashed, XY Saved)
SETCOL = $F864
TEXT = $FB36 ;; Set text mode
TABV = $FB5B
BASCALC = $FBC1
SETGR = $FB40
STORADV = $FBF0
HOME = $FC58 ;; Clear the text screen
WAIT = $FCA8 ;; delay 1/2(26+27A+5A^2) us
HLINE = $F819
CH = $24
CV = $25
COLOR = $30
TEMPY = $FF
graphic:
.byte $F0,$25,$1C,$F0,$26,$1C,$F0,$24,$6C,$A0,$1F,$F0,$16,$6D,$B0,$2F
.byte $F0,$15,$69,$B0,$3F,$F0,$14,$71,$A0,$4F,$F0,$13,$72,$A0,$5F,$F0
.byte $13,$56,$B0,$67,$F0,$20,$12,$10,$BF,$52,$F0,$12,$4D,$22,$1F,$31
.byte $42,$3F,$62,$F0,$0F,$6D,$22,$2F,$11,$34,$12,$4F,$72,$D0,$4D,$39
.byte $22,$BF,$82,$E0,$5D,$22,$BF,$92,$F0,$0F,$3D,$22,$A7,$BF,$F0,$11
.byte $12,$10,$9F,$17,$CF,$00
rle:
jsr SETGR
rerun:
lda #1
sta CH
jsr TABV
ldy #0
decode_loop:
lda graphic,Y
pha
jsr SETCOL ; puts (color&0xf)*17 in $30
pla
lsr
lsr
lsr
lsr
beq rerun ; if stride=0 then done
cmp #$f
bne ready
iny
lda graphic,Y
ready:
tax
sty TEMPY
final_loop:
lda COLOR
jsr STORADV ; destroys A and Y
dex
bne final_loop
ldy TEMPY
iny
jmp decode_loop
start:
jmp rle ; ampersand jumps to $3f5
; 140 is 8c in hex
; so want to load at $3f5-$8c+3 = $36C