A85: putting pixels

To: assembly-85@towerguard.unix.edu.sollentuna.se
Subject: A85: putting pixels
From: MalcolmJ1@aol.com
Date: Sun, 24 Jan 1999 14:19:40 EST
Delivered-To: assembly-85-outgoing@towerguard.unix.edu.sollentuna.se
Delivered-To: assembly-85@towerguard.unix.edu.sollentuna.se
Reply-To: assembly-85@lists.ticalc.org


i'm using usgard and i'm new to asm.  i have a small putpixel program to get
the hang of putting pixels.  here it is but it's not working because i don't
see the pixels showing up on the screen.  it is recognizing the key press to
exit but i just can't see dots.  if anyone sees the problem, can you help me
out?

jimi

here it is:

#include "usgard.h"

.org 0
.db "put pixels",0

initialize:
	ld	a,4		; set TI-85 to graphics mode.
	out	(5),a

	call	CLEARLCD

	ld	bc,$1010
	call	putpixel	; b = x coordinate, c = y coordinate

	ld	bc,$2020
	call	putpixel

	ld	bc,$0101
	call	putpixel

wait:
	call	GET_KEY
	or	a
	jr	z,wait
	ret

putpixel:
	call	FIND_PIXEL
	ld	de,$FC00
	add	hl,de
	or	(hl)
	ld	(hl),a
	ret

.end

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