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From: garyh@iddic.UUCP
Newsgroups: net.micro.cbm
Subject: RS232 H/W question
Message-ID: <1655@iddic.UUCP>
Date: Mon, 30-Apr-84 22:16:06 EDT
Article-I.D.: iddic.1655
Posted: Mon Apr 30 22:16:06 1984
Date-Received: Fri, 4-May-84 02:46:31 EDT
Organization: Tektronix, Beaverton OR
Lines: 19

Subject: RS232 H/W question
Newsgroups: net.micro.cbm

...
 
Does anyone know what's in Commodores RS232 cart? I am using a homebrew RS232
board which (unfortunately) has an external power supply for +/- 12V. How
(exactly) do they get the driver voltages from the +5DC and/or 9VAC? I know
that the trash-80 model 1  RS232 uses an
ASTEC module that takes in +5 and puts out +-12, but a photo of Commodore's
board shows only one (or so) other chips besides the line drivers/receivers.
Any help would be appreciated.
 
   Gary Hanson
{ allegra,decvax,..others..} tektronix!iddic!garyh
 
Dear Lisa and Mac: Sorry, but no mice allowed in my house; that's why I have
a cat. Also, if I want icons, I'll go to church. If I hear 'user friendly'
one more time, I'm gonna puke.