Delete comment from: Ken Shirriff's blog
Kaleberg stated/asked:
| I saw the 360/95 at Columbia/Lamont-Doherty's and NASA's
| Goddard Center back around 1970. It had a huge 4MB memory
| module. It was the size of an industrial AC unit with water
| pipes for cooling running in and out of it.
| I was told it was all core memory.
| Was it replaced with a thin film memory after my visit?
| Between that memory unit and the CPU there was a much smaller
| unit placed in a space clearly allocated for a module
| commensurate with the core memory unit. I was told it was a
| memory cache unit using "monolithic" memory technology.
| Perhaps that was the thin film memory unit?
Kaleberg, Your memory is excellent. To answer your questions:
The 4MB core memory unit was NOT replaced after your visit.
The 360/95 had BOTH core and thin-film memory units. Each
thin-film memory unit contained 64KB; the 360/95 had 16 thin-
film memory units totaling 1024KB (1MB) of very fast memory.
In addition, the 360/95 had 4MB of (ordinary) core memory.
Hence, a total of 5MB of "main" memory: 1MB really fast and
4MB relatively slow (but nonetheless very fast compared to
all but the 360/65 and 360/75 [and possibly the 360/85]).
Apr 23, 2019, 3:27:40 PM
Posted to Iconic consoles of the IBM System/360 mainframes, 55 years old