mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-11-16 23:20:43 +00:00
115 lines
1.8 KiB
ArmAsm
115 lines
1.8 KiB
ArmAsm
|
; Square Wave Pattern
|
||
|
|
|
||
|
|
; by Vince `deater` Weaver
|
||
|
|
|
||
|
|
; zero page locations
|
||
|
|
HGR_SHAPE = $1A
|
||
|
|
HGR_SHAPE2 = $1B
|
||
|
|
HGR_BITS = $1C
|
||
|
|
GBASL = $26
|
||
|
|
GBASH = $27
|
||
|
|
A5H = $45
|
||
|
|
XREG = $46
|
||
|
|
YREG = $47
|
||
|
|
; C0-CF should be clear
|
||
|
|
; D0-DF?? D0-D5 = HGR scratch?
|
||
|
|
HGR_DX = $D0 ; HGLIN
|
||
|
|
HGR_DX2 = $D1 ; HGLIN
|
||
|
|
HGR_DY = $D2 ; HGLIN
|
||
|
|
HGR_QUADRANT = $D3
|
||
|
|
HGR_E = $D4
|
||
|
|
HGR_E2 = $D5
|
||
|
|
HGR_X = $E0
|
||
|
|
HGR_X2 = $E1
|
||
|
|
HGR_Y = $E2
|
||
|
|
HGR_COLOR = $E4
|
||
|
|
HGR_HORIZ = $E5
|
||
|
|
HGR_SCALE = $E7
|
||
|
|
HGR_SHAPE_TABLE = $E8
|
||
|
|
HGR_SHAPE_TABLE2= $E9
|
||
|
|
HGR_COLLISIONS = $EA
|
||
|
|
HGR_ROTATION = $F9
|
||
|
|
FRAME = $FC
|
||
|
|
FRAMEH = $FD
|
||
|
|
XPOS = $FE
|
||
|
|
YPOS = $FF
|
||
|
|
|
||
|
|
; ROM calls
|
||
|
|
HGR2 = $F3D8
|
||
|
|
HGR = $F3E2
|
||
|
|
HPOSN = $F411
|
||
|
|
DRAW0 = $F601
|
||
|
|
XDRAW0 = $F65D
|
||
|
|
XDRAW1 = $F661
|
||
|
|
RESTORE = $FF3F
|
||
|
|
|
||
|
|
|
||
|
|
.zeropage
|
||
|
|
.globalzp rot_smc
|
||
|
|
|
||
|
|
square_wave:
|
||
|
|
|
||
|
|
; $E7
|
||
|
|
.byte $0A ; harmless ASL but also size of HGR_SCALE
|
||
|
|
; as we load this at $E7
|
||
|
|
|
||
|
|
; lda #10
|
||
|
|
; sta HGR_SCALE
|
||
|
|
|
||
|
|
; $E8,$E9,$EA (HGR_COLLISIONS=$F3)
|
||
|
|
|
||
|
|
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?
|
||
|
|
|
||
|
|
; tya
|
||
|
|
; tax ; load X with 0
|
||
|
|
; ldy #0
|
||
|
|
; ldx #00
|
||
|
|
; lda #00
|
||
|
|
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 ??
|
||
|
|
pattern_loop:
|
||
|
|
|
||
|
|
ldx #<pattern_table ; point to bottom byte of shape address
|
||
|
|
ldy #>pattern_table ; point to top byte of shape address
|
||
|
|
|
||
|
|
; ROT in A
|
||
|
|
|
||
|
|
; this will be 0 2nd time through loop, arbitrary otherwise
|
||
|
|
rot_smc:
|
||
|
|
lda #1 ; rotation (ROT=)
|
||
|
|
jsr XDRAW0 ; XDRAW 1 AT X,Y
|
||
|
|
; Both A and X are 0 at exit
|
||
|
|
; Z flag set on exit
|
||
|
|
; Y varies
|
||
|
|
|
||
|
|
inc HGR_BITS
|
||
|
|
|
||
|
|
; inc HGR_COLLISIONS
|
||
|
|
bne pattern_loop
|
||
|
|
|
||
|
|
inc rot_smc+1
|
||
|
|
|
||
|
|
ldx HGR_COLLISIONS
|
||
|
|
lda $F6F6,X
|
||
|
|
sta HGR_BITS
|
||
|
|
|
||
|
|
jsr $F3F6 ; clear screen to HGR_BITS
|
||
|
|
|
||
|
|
; jmp pattern_loop
|
||
|
|
|
||
|
|
beq pattern_loop ; bra
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
pattern_table:
|
||
|
|
.byte 37,53,0
|
||
|
|
|