On Thu, 17 Jan 2019 21:30:40 +0000, Seymour J Metz wrote: >BTW, by 1978 there was 3rd party memory on the market.
Considerably before that, actually. At Wayne State, we had a duplex model 67 that we ran partitioned, so that we could run MVT on one CPU and MTS on the other. We bought Fairchild semiconductor memory for it, probably about 2 MB. I'm not sure if MVT had 768 K or 1 M, and MTS had at least 1M. The memory came in frames about 2 feet by 2 feet by 5 feet tall, each one containing 256 K of memory at a cost of about $250,000. I seem to remember that it was a year or two later that we replaced the model 67 with an Amdahl 470V/6. That was in early 1977. Funny story about the memory. When it was delivered, the shipping company had arrived with only one man to deliver it. We didn't have a loading dock, so the driver rolled it onto the lift gate on the truck to lower it to the ground. One of the frames rolled right off the lift gate and fell on its side, destroying it. I remember later being able to shake the memory boards from that unit and hear the chips rattling in their packages. The memory boards were about a foot square and IIRC they were populated with 256 bit dynamic RAM chips. -- Tom Marchant ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
