; Print "HELLO WORLD" and play with P17.

; Version 1.0

; $Id: p17.a48 390 2003-07-19 12:41:28Z sgust $

; History:
; Version 1.0
;   first release

; This program simply prints "HELLO WORLD" on the screen. Additionally you
; can clear and set P17 by pressing 0 and 1.

; Copyright (C) 2003 by Soeren Gust, sgust@ithh.informationstheater.de

; Permission is hereby granted, free of charge, to any person obtaining a copy
; of this software and associated documentation files (the "Software"), to deal
; in the Software without restriction, including without limitation the rights
; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
; copies of the Software, and to permit persons to whom the Software is
; furnished to do so, subject to the following conditions:

; The above copyright notice and this permission notice shall be included in
; all copies or substantial portions of the Software.

; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
; THE SOFTWARE.

; You can always get the latest version at http://soeren.informationstheater.de

; This is ugly, badly commented, unsupported code!

	cpu	8048

	org	400h
	
	include	"g7000.h"

	jmp	selectgame	; RESET
	jmp	irq		; interrupt
	jmp	timer		; timer
	jmp	vsyncirq	; VSYNC-interrupt
	jmp	start		; after selectgame
	jmp	soundirq	; sound-interrupt

timer	retr			; we don't need timer

start
	call	gfxoff
	mov	r0,#vdc_char0
	mov	r3,#20h		; x-position
	mov	r4,#20h		; y-position
	mov	r2,#0bh		; length
	mov	r1,#hellostr & 0ffh	; the string to print, must be in the same page
loop	mov	a,r1		; get pointer
	movp	a,@a		; get char
	mov	r5,a		; into the right register
	inc	r1		; advance pointer
	mov	r6,#col_chr_white
	call	printchar	; print it
	djnz	r2,loop		; do it again

	; add some grid
	mov	r0,#vdc_gridv0
	mov	a,#001h
	movx	@r0,a
	inc	r0
	movx	@r0,a
	mov	r0,#vdc_gridh0
	mov	a,#003h
	movx	@r0,a

	; set background and grid color
	mov	r0,#vdc_color
	mov	a,#col_bck_black | col_grd_yellow
	movx	@r0,a
	call	gfxon		; lets see what is written

.loop	call	waitforkey
	jz	.clear
	dec	a
	jz	.set
	jmp	.loop

.clear	anl	P1,#07fh
	jmp	.loop

.set	orl	P1,#080h
	jmp	.loop
	
hellostr	db	1dh, 12h, 0eh, 0eh, 17h, 0ch, 11h, 17h, 13h, 0eh, 1ah