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From: BillW@su-score.arpa
Newsgroups: net.micro
Subject: Re:  HP150 Tone Generator
Message-ID: <1779@brl-tgr.ARPA>
Date: Mon, 20-Jan-86 21:38:36 EST
Article-I.D.: brl-tgr.1779
Posted: Mon Jan 20 21:38:36 1986
Date-Received: Sat, 25-Jan-86 08:48:46 EST
Sender: news@brl-tgr.ARPA
Lines: 21

The tone generator on the hp150 is in the 8041 that scans
the keyboard and touchecreen.  It's documented on page 3-50
and 3-51 of my "preliminary technical reference manual".  I
don't know if this ever made it to print in  a less preliminary
form, but here is the relevant data:

8041 commands IO port (19h)

comand code		Function
   08h		Stop bell immediately
   22h		keyclick off
   23h		keyclick on
30h-3Fh		Beep bell.   duration is about 100ms, and the tone
		is determined by the low nibble (about 290 Hz for 0
		and 1.7Khz for F.
   40h		do one keyclick immediately.  keyclick must be on.

Those are only the codes that have to do with sound...

Enjoy
BillW