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From: cameronjames@snoc01.enet.dec.com (James Cameron)
Newsgroups: comp.sys.tandy,comp.sys.laptops
Subject: Re: Model 100: How to interface with system bus?
Keywords: Model 100, system bus, peripherals
Message-ID: <1991Mar5.130348@snoc01.enet.dec.com>
Date: 5 Mar 91 03:07:38 GMT
References: <23244@well.sf.ca.us> <1991Feb10.203444.18109@daffy.cs.wisc.edu>
Sender: newsdaemon@shlump.nac.dec.com
Reply-To: cameronjames@snoc01.enet.dec.com (James Cameron)
Followup-To: comp.sys.tandy
Organization: Digital Equipment Corporation (Australia)
Lines: 23

In article <23244@well.sf.ca.us>, tswift@well.sf.ca.us (Theodore John Swift)
writes:
>Please help!  I'm trying to attach peripherals (A/D converters, analog
>multiplexers) to the system bus socket of a Model 100. 

Me too.  I want to make a MIDI interface.  I intend to model it on the design
published in the MISOSYS Quarterly (V.i) for TRS-80's.  I need to know what I/O
controller chip I can use to replace the Z80-SIO that that design calls for. 
The 80C85 processor on the Tandy 102 that I have uses a multiplexed address and
data bus.

>I have a copy of _Inside the Model 100_

Could you let me know the author and publisher of this work?

Have you thought of using a small RS232 UART chip in place of a direct
connection?  Admittedly it would be an extra few components, but at least it
would be compatible with more machinery.

--
James Cameron
Digital Equipment Corporation (Australia) P/L
(cameronjames@snoc01.enet.dec.com)