"Dick Hendrickson" <dick.hendrickson@att.net> wrote in message news:874gafFcadU1@mid.individual.net...
| On 6/7/10 7:35 AM, Yannick Duch�ne (Hibou57) wrote:
| > What is a "drum memory" ?
|
| I think it was the successor to CRT memories.  ;)

Drum memories were't successor to anything.
They were intended as a cheap but fast mass-storage device.
They existed concurrently with mercury delay line memories,
CRT memories, nickel delay line memories.

They were made from about 1953, if not before.