On 06/15/2020 10:19 AM, Jay Jaeger via cctalk wrote:
The IBM mainframe memory add ons  I was familiar with were from Itel rather 
than Intel.  I don’t see how intel could have had semi memory for mainframes in 
the early 1970s.
We had Intersil static RAM on our IBM 370/145 machines in the early 1970's. These were serviced by Memorex. It looks like some of the revision dates on the schematics are 1977, though.

Jon

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