> On Apr 21, 2016, at 7:33 PM, Chuck Guzis <ccl...@sydex.com> wrote:
>
> ...
>> 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.
Yup. A couple of us helped put the PLATO copy running on the DtCyber emulator
together, see cyber1.org.
paul
