26 May
2005
26 May
'05
4:33 p.m.
William wrote:
Around 1982 or so, an RP-20 showed up at CMU. As I
recall, it stored an entire gigabyte on a pair of
HDAs in a single cabinet.
I'm not sure whether IBM made the HDAs, drives, or perhaps the
entire drive cabinet, but the RP20 subsystem used drives with
an IBM bus/tag interface, attached via a DX20 Massbus-to-IBM-bus/tag
interface, which was a fancy microcoded thing.
There was also a TX20 formatter for IBM bus/tag tape drives; I think
it may have been a DX20 running different microcode.