300mb disc drives

[Jim Isbell, W5JAI]

I used a 70 MB HD back as early as 1976.  Cant temember the manuf, but
the disks (there were 3 I think) were about 14" in diameter.  I still
have one of the disks, or I should say set of three, down in the
garage and have been thinking about making a clock out of it.  Its a
beautiful piece of machined brass and aluminum with a magnetic coating
on it.

On 5/26/05, Eric Smith <eric at brouhaha.com> wrote:
> 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.
> 
> 
> 
> 


-- 
Jim Isbell
"If you are not living on the edge, well then, 
you are just taking up too much space."
W5JAI
UltraVan #257
CAL - 27   #221
1970 E-Type
1985 XJS
1982 XJ6