On 06/05/2018 02:53 PM, Robert Armstrong via cctalk wrote:
> I too have heard that RC25s and PDP-11s were used in nuclear subs for some
> kind of sonar thingie. I've no idea how that worked, except that maybe DEC
> gave all the good drives to the Navy and the rest of us got the crappy ones.
I used mine for more than 10 years and have no idea how long
or much the previous owners used it. Never a problem. I kept
the KLESI module to use with tape drives after I gave the disk
away. Now that was a truly weird system. same controller but
the cable went one way for a disk and the other way for a tape.
>
> They worked as long as you didn't spin them down or try to change the
> removable pack. The removable part would crash at the drop of a hat and, of
> course given the clever shared spindle design, if the removable part wouldn't
> spin up then neither would the fixed part.
>
> I have (I think) three drives, or maybe just two. Two are internal drives
> for the 725 and one is in the table top enclosure. None work. If anybody
> has any tips for fixing them, or even just a kludge to spin up the Winchester
> part without needing the removable part to work too, I'm all ears.
Mine was the tabletop model.
>
>> Ethan Dicks <ethan.di...@gmail.com> wrote:
>> I often wonder how hard it would be to develop some other storage
>> device for the KELSI
> AFAIK the LESI ("Low End Storage Interconnect") protocol is not documented
> anywhere, unlike SDI or MASSBUS which are. If it is, I've never found it. I
> have several UNIBUS KLESI boards and I've often thought the same thing, but
> I'm not really interested in trying to reverse engineer the protocol w/o
> documentation.
>
bill
