15 Apr
2024
15 Apr
'24
7 a.m.
On Mon, Apr 15, 2024 at 12:53 AM Christopher Zach via cctalk <
cctalk(a)classiccmp.org> wrote:
<snip>
As late as 1980, PDP-11/45 machines using magnetic core main memory
and drums for swapping were still in use at many of the original UNIX
sites.
Any thoughts on what they are talking about? I could see running the
RS03/RS04 on a 11/45 with the dual Unibus configured so the RS03's talk
to memory directly instead of the Unibus, but that's not quite the same
as true drum memory.
<snip>
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