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From: rjk@sequent.com (Robert Kelley)
Newsgroups: comp.sys.nsc.32k
Subject: Re:  PC532 Expansion & other questions
Message-ID: <9011291657.AA10497@eng2.sequent.com>
Date: 29 Nov 90 16:57:50 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?
> 
> 3) Along the lines of question 2, I'd like some additional interrupts.
>    can I cascade another ICU using the daughterboard technique des-
>    cribed above?
> 

Me too, I want to hang strange devices off my PC532 without the hassle of SCSI.
I haven't thought about exactly how to do it yet, but let's keep in touch about
it.

Bob Kelley
rjk@sequent.com