mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-06-16 07:29:29 +00:00
52 lines
1.0 KiB
ArmAsm
52 lines
1.0 KiB
ArmAsm
; 15B Weave Pattern
|
|
|
|
; by Vince `deater` Weaver / DsR
|
|
|
|
; for Lovebyte2023
|
|
|
|
; zero page locations
|
|
GBASL = $26
|
|
GBASH = $27
|
|
HGR_SCALE = $E7
|
|
|
|
; ROM locations
|
|
HGR2 = $F3D8
|
|
HPOSN = $F411
|
|
XDRAW0 = $F65D
|
|
XDRAW1 = $F661
|
|
HPLOT0 = $F457
|
|
|
|
weave15:
|
|
|
|
; we load at zero page $E7 which is HGR_SCALE
|
|
; this means the scale is $20 (JSR)
|
|
|
|
jsr HGR2 ; Hi-res, full screen ; 3
|
|
; Y=0, A=0 after this call
|
|
|
|
; A and Y are 0 here.
|
|
; X is left behind by the boot process?
|
|
|
|
; set GBASL/GBASH
|
|
; we really have to call this, otherwise it won't run
|
|
; on some real hardware depending on setup of zero page at boot
|
|
|
|
jsr HPLOT0 ; calls HPOSN and maybe sets some
|
|
; registers a bit better?
|
|
|
|
; jsr HPOSN ; set screen position to X= (y,x) Y=(a)
|
|
; saves X,Y,A to zero page
|
|
; after Y= orig X/7
|
|
; A and X are ??
|
|
tiny_loop:
|
|
lda #$E2 ; load $E2 into A, X, and Y
|
|
tax ; our shape table is in ROM at $E2E2
|
|
tay ; ROT is in A, but mod64
|
|
|
|
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
|