[Simh] RT-11 Storage Strategy

[Clem Cole]

Sorry, I should have said an RK05 on an 11/34 or /44 (or even the original
/20);  I did not mean to imply/have that sentence parsed to mean that
RK05's were not on the QBUS.

My point was there were a number of Unibus RT-11 systems sold that ran on
the RK05's and that if you were trying to get the an experience of what
many users had, that would be where I would start.   Certainly that matched
my own experience in school and in industry.

By the time of the rise of the QBUS systems, I had personally stopped using
RT-11 and I would have expected most people to be using newer technology,
if only for cost per bit reasons.  I know I was using newer storage
technologies on my Vaxen and later Unix workstations.

That DEC and customers put RK05's on QBUS is not a surprise if only because
that was a popular technology, although the price/bit by then was in favor
of MFM/ESDI and eventually SCSI technologies.  On the other hand, IIRC
there were aftermarket controllers for QBUS by then that used the newer
technologies and I would have expected people running RT-11 to want to use
them if nothing else for space reasons [RK05 was a 19" rackmount
technology, where as the MFM/EDSI/SCSI disks had moved to 5 1/4"].

On Wed, Feb 17, 2016 at 10:36 AM, Alan Frisbie <Frisbie at flying-disk.com>
wrote:

> On 02/17/2016 05:43 AM, Clem Cole wrote:
>
> That said, if you used RK05's you certainly would be building a
>>
> > simulated Unibus system that was close to what many people had.
>
> Not necessarily.   Don't forget the RKV11-D Q-Bus controller for
> RK05 disks.   I have one here, with both an RK05J (removable)
> and an RK05F (fixed).   I used it with my original LSI-11 before
> finally upgrading to an 11/73.   I usually use them to run RT-11,
> but have booted the RSX-11M v2.0 RK05 on it.
>
> Alan Frisbie
>
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