On 15/04/2024 15:00, Bill Degnan via cctalk 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.
Bill
There is a mention of drum memory storage in the PDP-11 Memory
Management handbook:
http://www.bitsavers.org/www.computer.museum.uq.edu.au/pdf/DEC-11-HGKTCB-D%20PDP-1145%20Memory%20Management%20Reference%20Manual.pdf
page 21
I imagine that any "drum like storage" attached to an 11/45 would be
fixed head disk storage rather than actual drum memory. After all, from
a digital perspective they're identical. Josh
