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Newsgroups: comp.sys.nsc.32k
Subject: Re:  PC532 Expansion & other questions
Message-ID: <9011300109.AA16930@manatee.UUCP>
Date: 30 Nov 90 06:09:57 GMT
References: <<1990Nov28.18333.0@ucrmath.ucr.edu>>
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> 2) I'm interested in a little off-board expansion without going through the
>    SCSI bus (I'm not ready to tackle the design of a smart SCSI controller).
>    I was thinking of popping off one of the DUARTs, running a couple of addit-
>    ional address lines (and unused decoding lines from the '138)
>    over to the socket and building a daughterboard to plug into
>    the DUART socket.  I'd like to put a couple of parallel ports
>    (perhaps a 6522 or 8255), an 8530 (I want to build an Appletalk
>    interface), and some other devices.  Any problems anyone can warn
>    me about?

May I suggest you also consider using a PC as an IO server.  If  
performance is not the primary consideration, all things considered,
this seems to me to be a clean approach.  

-- 
John Connin: manatee Orlando, Florida
         UUCP: {uunet,ge-dab,ucf-cs}!tarpit!tous!manatee!johnc