Double Buffer RK11-C

Ethan Dicks ethan.dicks at
Thu Nov 17 21:15:41 CST 2016

On Thu, Nov 17, 2016 at 10:09 PM, Noel Chiappa <jnc at> wrote:
>     > Subject: Does anyone actually have a KT11-B?
>     > Date: Fri Sep 30 19:04:47 CDT 2016
>     > the ones shown in the images show it to be (mostly) an RK11-C.
>     > ...
>     > I say "mostly" because there appear to be extra cards on the right hand
>     > end; whether those are some sort of upgrade to the RK11-C, or whether
>     > someone just stored spare Flip Chips out there, I have no idea.
> So this mystery has been solved (sort of).  According to some drawings I have,
> there is apparently something called a "Double Buffer Disk Control" variant of
> the RK11-C. I looked online, but there was nothing about it there, and the
> RK11-C Engineering Drawings at BitSavers don't cover this variant. Does anyone
> out there have one of these?

I have an RK11-C that I've never attempted to power on.  I haven't
even made an inventory of it.  What would I look for to know?


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