On Mon, Apr 15, 2024 at 12:53 AM Christopher Zach via cctalk < cctalk@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
