15 Apr
2024
15 Apr
'24
9:06 a.m.
At the VFC East just a few days ago a young man came up to me, I had a
PDP11/53 on display, and showed me pictures of his 11/45 and PDP-8 that
he had just acquired and needed to learn about. It was impressive, he
said the 11/45 was missing the memory boards. If he shows up here on
the list please help him. To me, it look like he had stumbled into a
Unicorn.
Doug
On 4/13/2024 5:26 PM, Christopher Zach via cctalk wrote:
Was reading the Wikipedia article on Drum memories:
https://en.wikipedia.org/wiki/Drum_memory#External_links
And came across this tidbit.
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.
Closest thing I remember was the DF32 on a pdp8 which could be
addressed by word as opposed to track/sector.
Thoughts?
C