PDP-11 disk image question

Bill Gunshannon bill.gunshannon at hotmail.com
Tue Feb 19 13:22:13 CST 2019

On 2/19/19 12:37 PM, Glen Slick via cctalk wrote:
> On Tue, Feb 19, 2019 at 5:39 AM Bill Gunshannon via cctalk
> <cctalk at classiccmp.org> wrote:
>> All sounds like fun, but if the two emulations don't do RA81
>> correctly the information doesn't really do me much good.  I
>> certainly can't change the CQD's idea of what an RA81 is.
> I have mostly used CMD CQD-220/TM controllers. As far as I remember
> they do not have an RA drive emulation option.

I have a 220A/TM and it certainly does.  Pages 4-10 thru 4-15
of the manual, particularly Configuration Options "A" and "1".

> I also have some of the newer CMD CQD-220A/E controllers (the 220A/E
> being Either MSCP or TMSCP but not both at the same time, while the
> 220A/TM can be both MSCP and TMSCP at the same time). I'll see if I
> can find some time today to take a look at the RA drive emulation
> option using a CMD CQD-220A/E controller, and see exactly what it
> reports for MSCP drive geometry.

Not familiar with the 220A/E it's not mentioned in my manual.
Probably a much newer version.


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