On Apr 16, 2024, at 10:15 AM, William Donzelli via
cctalk <cctalk(a)classiccmp.org> wrote:
I'll bet the source was talking about large
contemporary storage units that
looked like drums or may have been called "drums" but were not actual 50's
drum memory with tubes and such. There was no rotating drum storage, the
media rotates in the PDP era.
Take a look at any pdp 11 peripheral handbook, there would be drum memory
there if it was an official product.
Key words being "official product".
Digital CSS department - Computer Special Systems, where all that
weird stuff that was DEC engineered and built came from. Call it "low
run semi custom".
For that matter, there are a lot of DEC products not seen in any Handbook. If you want to
see everything that was produced by DEC, check the Option/Module list.
To pick an example, the typesetting products were certainly official DEC products, not
CSS, though admittedly low volume. But you won't find the PA611, or the VT61/t, or
the VT71 or VT20, in any peripheral or other "handbook".
paul