Delete comment from: Ken Shirriff's blog
Trying again without typos... Would love to hear about the plated/etched memory used for "microcode" in the 360/67 back in 1970. Is anything published? Our IBM FE did a [temporary] repair on one my machines using SaranWrap from a local store. The machine was used for timesharing and an outage meant lost revenue of multi $k per hour, so a lot of pressure to fix a down system. The machine was a duplex for which a team of three of us developed the OS support. We upgraded the IBM core memory on the machine with semi conductor memory by AMS. More memory... more reliable (no more "shmooing")... less space... lower cost. We then took program compatible machines from Amdahl then back to IBM with big 370 systems. Exciting times... and as you say, machines less powerful than a cellphone (but we did more with them).
Feb 1, 2021, 11:03:07 AM
Posted to IBM paperweight teardown: Reverse-engineering 1970s memory chips