mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-11-01 01:06:33 +00:00
56 lines
969 B
ArmAsm
56 lines
969 B
ArmAsm
; 17B weird line pattern
|
|
|
|
; Really wanted this to be 16B :(
|
|
|
|
; zero page locations
|
|
GBASL = $26
|
|
GBASH = $27
|
|
HGR_SCALE = $E7
|
|
HGR_COLLISIONS = $EA
|
|
|
|
; ROM locations
|
|
HGR2 = $F3D8
|
|
HPOSN = $F411
|
|
XDRAW0 = $F65D
|
|
XDRAW1 = $F661
|
|
HPLOT0 = $F457
|
|
|
|
RESTORE2 = $FF42
|
|
|
|
agony17:
|
|
|
|
; we load at zero page $E7 which is HGR_SCALE
|
|
; this means the scale is $20 (JSR)
|
|
|
|
jsr HGR2 ; Hi-res, full screen ; 3
|
|
; Y=0, A=0 after this call
|
|
|
|
; A and Y are 0 here.
|
|
; X is left behind by the boot process?
|
|
|
|
; set GBASL/GBASH
|
|
; we really have to call this, otherwise it won't run
|
|
; on some real hardware depending on setup of zero page at boot
|
|
|
|
jsr HPLOT0
|
|
|
|
; jsr HPOSN ; set screen position to X= (y,x) Y=(a)
|
|
; saves X,Y,A to zero page
|
|
; after Y= orig X/7
|
|
; A and X are ??
|
|
tiny_loop:
|
|
lda #$E2
|
|
tax
|
|
tay
|
|
|
|
; ldx #$E2
|
|
; ldy #$E2
|
|
|
|
; lda #2 ; ROT=2
|
|
jsr XDRAW0 ; XDRAW 1 AT X,Y
|
|
; Both A and X are 0 at exit
|
|
; Z flag set on exit
|
|
; Y varies
|
|
|
|
beq tiny_loop ; bra
|