Diablo disk unit

Paul Anderson useddec at gmail.com
Sat Jan 17 01:36:02 CST 2015

I have a few RK11-C backplanes and a RK03 if anyone is interested.  Feel
free to contact me offlist.

Thanks, Paul

On Sat, Jan 17, 2015 at 12:15 AM, tony duell <ard at p850ug1.demon.co.uk>

> >
> > Can anyone shed a light on this?
> >
> http://produto.mercadolivre.com.br/MLB-616158449-diablo-series-unidade-de-disco-30-_JM
> It appears to be a standard Diablo model 30 disk drive. This is a front
> loading hard disk, similar
> to an RK05, in fact it was used on the PDP11 with the RK11-C (but not
> RK11-D [1]) controller.
> There are 2 versions, low and high density, which DEC badged as the RK02
> and RK03. The latter
> is format-compatible with the RK05, the former (which is much less useful)
> has half the bit
> rate. It needs an external +/-15V power supply (I can't remember if it
> needs +5V too).
> [1] It uses 1-of-n selects, not the binary select scheme used by the
> RK11-D. It is possible
> to kludge in a decoder to get the high density model working on an RK11D.
> AFAIK the
> RK11-C supports both data rates, the RK11-D doesn't, so the low density
> version is pretty
> much RK11-C only.
> One oddity is the head positioner. It's a permanent magnet commutator type
> motor
> with a rack and pinion mechanism.
> -tony

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