Thoughts on restricted distribution documents (Dec Professional 350)

Rob Jarratt robert.jarratt at
Tue Sep 29 10:31:18 CDT 2020

I have broken 350s and would love to get hold of this information too...



> -----Original Message-----
> From: cctalk <cctalk-bounces at> On Behalf Of Paul Koning via
> cctalk
> Sent: 29 September 2020 15:16
> To: Chris Zach <cz at>; cctalk at
> Subject: Re: Thoughts on restricted distribution documents (Dec
> 350)
> I have wanted to see that for my work on the Pro.  It would be great to
get it
> scanned and posted, whether the copy lands on Bitsavers or elsewhere.  As
> as I know it is not currently available.
> Does it include the programming manual for the 4-line UART option board?
> have such a board and since I wrote a driver for it, decades ago, I must
at one
> time have had a programming manual, but I certainly don't have it any
> The internal bus and the boot ROM details are examples of stuff not
covered in
> the currently available manuals on Bitsavers; those details were not
exposed to
> the outside world for some reason.
> 	paul
> > On Sep 29, 2020, at 10:10 AM, Chris Zach via cctalk
<cctalk at>
> wrote:
> >
> > Question for the group: I have a document set here from DEC that is the
> Hardware Handbook". It's basically the entire pre-release documentation
> for the "XT-100" terminal/computer which became the Professional 325/350.
> >
> > Is there a copy of this on the internet, and what are the thoughts on
> this? Is there already a better copy of this information out there, this
seems to
> cover the whole internal bus, how the cards work, and so forth...
> >
> > Chris

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