Thoughts on restricted distribution documents (Dec Professional 350)

Chris Zach cz at
Tue Sep 29 13:29:50 CDT 2020

Ok, it's scanned and a compressed PDF is up at:

Some of the pages are slightly skewed, I'll see about correcting those 
before putting the whole .tiff set up there (that's over 14gb). Not much 
difference between 300dpi (the first 20 pages) and 600dpi (the rest) so 
I might just scan at 300dpi going forward.


On 9/29/2020 11:31 AM, Rob Jarratt wrote:
> I have broken 350s and would love to get hold of this information too...
> Regards
> Rob
>> -----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
> Professional
>> 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
> far
>> as I know it is not currently available.
>> Does it include the programming manual for the 4-line UART option board?
> I
>> 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
> longer.
>> 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
> "XT
>> Hardware Handbook". It's basically the entire pre-release documentation
> set
>> 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
> scanning
>> 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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