21 Apr
2016
21 Apr
'16
5:50 p.m.
On Apr 21, 2016, at 7:33 PM, Chuck Guzis <cclist at
sydex.com> wrote:
...
Yup. A couple of us helped put the PLATO copy running on the DtCyber emulator together,
see cyber1.org.
paul
Neat. PLATO made extensive use of ECS, swapping
per-terminal state
and programs in and out of ECS for fast interactive service. ECS was
also where most I/O buffers went, with PPUs doing disk and terminal
I/O from/to ECS rather than central memory. A dual mainframe 6500
system (4 "unified" processors total) did a decent job supporting 600
concurrent logged-in terminals, out of a total of 1008 connected.
That was around 1977 when I worked on that system at the U of
Illinois.
Was that UIUC? I processed some CYBER tapes from there a couple of
years ago--there's an archivist there who uses us to retrieve contents
of various dusty items.