Delete comment from: Ken Shirriff's blog

Frank Baldino said...

Great job Ken. I was trained on the 360 Model 25 in 1976 as an IBM Customer Engineer. It was used as the front end to the 3890 check sorter. The early versions used core memory and I believe that may be the last storage technology where you can visually see 1 bit. I still have a 2K module consisting of several flat planes. There are 9 'donuts' for each the byte, the last bit serving as an error detection bit. These machines were really a lot of fun to diagnose and fix.

Apr 8, 2019, 9:55:56 AM

Posted to Iconic consoles of the IBM System/360 mainframes, 55 years old