Palm OS 68k asm help needed

I'm trying to make a PalmOS program that changes the background to black and draws '1' and '0' all over the screen in random positions, alternating between light and dark green to create the matrix movie look. I borrowed this idea from Polaris, who wrote a C++ demo coding tutorial for Hugi #31. Anyway, nothing is displaying when I try to run this thing under Palm OS Garnet Simulator (5.4.0) Thankfully no crashing happens and I can exit the program fine. Thanks.

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        Appl    "Mtxeffect", 'MTX1'    	
        include "c:\program files\pila\inc\Palm4.inc"		
        include "c:\program files\pila\inc\Startup.inc"		
	include "c:\program files\pila\inc\Window.inc"

MyAlert	  equ     1000			; Some Constants

struct Coord
	x.l
	y.l
endstruct

	data
strNumber dc.b '01',0
	
        code				
proc PilotMain(cmd.w, cmdPBP.l, launchFlags.w)
local   evt.EventType
local	pos.Coord
local	screenrect.Coord
local	txtcolor.RGBColorType
local	bkcolor.RGBColorType

beginproc			
;	trap	#8	; this is the equivalent of 80x86 int 3h
        TST.W   cmd(a6)
        BNE     PmReturn

; ================ preserve screen state ====================

	systrap WinPushDrawState()

; ================ get current screen dimensions ==================

	systrap WinGetWindowExtent(&screenrect.x(a6).l, &screenrect.y(a6).l)

lp:

; ================ set up random x,y coordinates ==================

systrap SysRandom(#0.l)
divs screenrect.x(a6), d0 ; screenrect.x(a6) % d0
lsr.l #8, d0 ; shift remained in high word to ; low word
addq #1, d0
move d0, pos.x(a6)

	systrap SysRandom(#0.l)
	divs	screenrect.y(a6), d0
	lsr.l	#8, d0
	addq #1, d0
	move d0, pos.y(a6)

; ================= set background color ==================

move.l #0, bkcolor.unused(a6) ; entire struct is 4 bytes long
systrap WinSetBackColorRGB(&bkcolor(a6).l, #NULL.l)
bra event_lp ; this is placed here for troubleshooting ; purposes, will remove when background sets ; correctly

; ================= determine green color ================

set_color:
	systrap SysRandom(#0)
	andi	#0, d0
	tst	d0
	beq setLightGreen
		move #$0000FF00.l, txtcolor.unused(a6)
		systrap WinSetTextColorRGB(&txtcolor(a6).l,#0)
		bra draw_num
	setLightGreen:
		move #$00005500.l, txtcolor.unused(a6)
		systrap WinSetTextColorRGB(&txtcolor(a6).l,#0)
	
; ================= draw 0 or 1 =====================

draw_num:
	systrap SysRandom(#0)
	movea.l	strNumber(a5), a1
	andi	#0, d0		; d0 % 2 = test for even/odd number
	tst	d0
	beq	draw1
	
	draw_0:
		systrap WinDrawChars(a1.l,#1.w,pos.x(a6).l,pos.y(a6).l)
		bra event_lp
	
	draw1:
		movea.l	strNumber(a5), a1
		addq.l #1, a1
		systrap WinDrawChars(a1.l,#1.w,pos.x(a6).l,pos.y(a6).l)

; ================= event processing ==================

event_lp:
	systrap EvtGetEvent(&evt(a6).l, #0.l)
	systrap SysHandleEvent(&evt(a6).l)		
        cmpi.w  #appStopEvent, evt+EventType.eType(a6)
        bne event_lp

PmReturn				; Just a Label

; ================ restore screen state ====================

	systrap WinPopDrawState()
        endproc				

;-----------------------Resources---------------------------------------------------------------
; We now declare the resources being used by Hello.asm
; the keyword 'res' is first placed; followed by the TYPE of the
; resource.
	
	;-=Version Resource=-
        res 'tver', 1
        dc.b    '1.0', 0

; This resource defines launch flags, stack and heap size :)
res 'pref', 1
dc.w sysAppLaunchFlagNewStack|sysAppLaunchFlagNewGlobals|sysAppLaunchFlagUIApp|sysAppLaunchFlagSubCall
dc.l $1000 ; stack size
dc.l $1000 ; heap size
.