Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!watmath!clyde!cbosgd!ihnp4!ihwpt!knudsen
From: knudsen@ihwpt.UUCP (mike knudsen)
Newsgroups: net.micro.6809
Subject: Re: Orchestra-90 on coco-ii
Message-ID: <909@ihwpt.UUCP>
Date: Fri, 13-Jun-86 14:16:46 EDT
Article-I.D.: ihwpt.909
Posted: Fri Jun 13 14:16:46 1986
Date-Received: Tue, 17-Jun-86 19:05:27 EDT
References: <339@msudoc.UUCP>
Organization: AT&T Bell Laboratories
Lines: 20

> I am experimenting on the side with sound generation on my CocoII. I
> have the Orchestra-90 pack for it. From the schematics for Orch90 it is
> obvious that it consists of software and two D/A converters. I'd like to
> hear from anyone who has figured out the addresses of these two A/D
> converters. Then, I should be able to experiment with custom waveforms,
> etc. Thanx
>             *********                  John H. Lawitzke
Well, I don't know the addresses, since I use an otherwise identical
"Stereo Pak" made by Speech Systems, Batavia, Ill.
I'd suggest PEEKing at addresses starting at FF50 and going by
multiples of 4 till you read what looks like an ACIA (6820),
assuming that's what Orch-90 uses.  Or try POKEing away,
alternating 255 and 0, till you hear a click in your speaker.

If you want some of my software music stuff, written over the
last three years (including a score compiler with DECENT notation
and a real-time wah-wah organ program using FM sysnthesis),
email me for where to send a blank diskette.
(Say -- Steve Swope, are you still alive?)
	mike k