DEC part number system

Vincent Slyngstad v.slyngstad at
Thu Dec 31 17:19:28 CST 2020

On 12/31/2020 12:48 PM, Noel Chiappa via cctalk wrote:
> So, DEC part numbers (xx-yyyyy-zz) have a system where the 'xx' says what
> _kind_ of part it is; e.g. bootstrap PROMs are all 23-xxxxx-yy. I seem to
> recall reading at some point something which listed all the xx- codes, and
> what they meant - but now I can't find it. A Web search didn't turn it up, and
> it's not in the 1974 'engineering handbook'?
> Does anyone recall seeing it, and if so, where?

I knew I had the documents, but I couldn't figure out where I originally 
got them.  (They seem to have been converted from TIFF, so maybe highgate?)

Anyway, the "Spare Parts List" links on this page are relevant:

> Obviously, I could look through a bunch of print sets, and reconstruct it
> (e.g. 90- seems to mean mounting hardware - nuts and bolts, etc) but I'd
> rather not put the time and energy into reconstructing the wheel, unless
> there's no other way.

These documents are dated July and Sept. 1970, so you may well want to 
do that work anyway, to get a handle on the newer part numbers.


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