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From: kc4zvw@stardust.oau.org (David Billsbrough)
Subject: Re: How to get 128 bits of digital I/O the easy way?
Organization: Stardust Data Systems
Date: Wed, 17 May 1995 16:31:58 GMT
Message-ID: <D8qDxC.Myr@stardust.oau.org>
References: <D8LMpI.EBE@stardust.oau.org> <3p81sb$9qo@fermat.mayo.edu>
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Xref: glinda.oz.cs.cmu.edu sci.electronics:132794 comp.robotics:20818

Jim Craighead wrote:

> >I would like to implement at least 64 bits of input and 64 bits of output
> >on an embedded controller as a project.  I thought of using a 'heap' of
> >82C55 PIA chips but does anybody else have an easier or cheaper solution?
> 
>  There are easier/different ways, but they are dependant on your application.
> Why do you need 128 bits of I/O?

This device is to be a programmable continuity checker and would be controlled
by a host computer.  I wanted to use a microcontroller, instead of a plug-in
board for the PC's ISA bus, so that it could be used with non-PC and laptop
machines.  I would be using the serial interface to 'talk' with the host
computer and the host would request which bit is to be set and would receive 
binary numbers from the controller with which bits were 'high' on the input 
port.

I would prefer to use a 8051 family microcontroller but the 68HC11 has not
been ruled out.

// David //
-- 
David Billsbrough
kc4zvw@stardust.oau.org
