dos33fsprogs/demos/demosplash2022/apple_logo.s
Vince Weaver 8483cc9d95 demo: more unadvised messing around
worried there's a glitch in the sound at least on AppleWin
mame is fine
2022-11-17 21:24:00 -05:00

38 lines
723 B
ArmAsm

draw_apple:
;=============================
; draw apple shape table logo
;=============================
; rotation in A
pha
scale_smc:
lda #10
sta HGR_SCALE
ldy #0
ldx #60
txa
; lda #60
jsr HPOSN ; set screen position to X= (y,x) Y=(a)
ldx #<apple_table ; point to bottom byte of shape address
ldy #>apple_table ; point to top byte of shape address
; ROT in A
; this will be 0 2nd time through loop, arbitrary otherwise
pla ; ROT
jmp XDRAW0 ; XDRAW 1 AT X,Y
; Both A and X are 0 at exit
; Z flag set on exit
; Y varies
;apple_table:
;.byte $27,$2c,$35,$8e,$24,$2c
;.byte $35,$be,$09,$24,$2c,$35,$be,$09
;.byte $20,$24,$8c,$12,$2d,$3c,$37,$2e
;.byte $0d,$25,$24,$4f,$39,$36,$2e,$00