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From: cabbie@chinet.UUCP (Richard Andrews)
Newsgroups: net.micro.atari8
Subject: RS-232 port mod
Message-ID: <611@chinet.UUCP>
Date: Fri, 10-Oct-86 01:31:15 EDT
Article-I.D.: chinet.611
Posted: Fri Oct 10 01:31:15 1986
Date-Received: Sat, 11-Oct-86 20:38:23 EDT
Reply-To: cabbie@chinet.UUCP (Richard Andrews)
Organization: chinet, Public Access UN*X, Chicago IL
Lines: 22
Keywords: RS-232 port for the XL-XE's


	I have been contemplating a mod to the XL-XE line of Atari
computers.  It is a uart (RS-232 port). The way that I see it, it 
wouldn't require too much work.  It would be interrupt driven for receive 
and transmit.  There are two unused interrupt vectors in the OS,  namely
VPRCED and VINTER at locations $202-203 and $204-205.  The uart would be 
mapped to $D700-$D70F.  The code for the actual IO would boot from disk like
the the 850 code does now.  I have the chip count up to 3 chips and now
I have two questions-

1) Is anyone interested in such a mod either internal or external to their
   machine as a public domain item? (internal would be neat...just a DB-25
   connector out the rear.)

2) Is anyone interested in marketing such a modification?

The total cost to build should be around $25-$30 tops.

Any comments??????  reply to....

					Rich Andrews
					...ihnp4!chinet!cabbie