Got DSM-11 running, any manuals online?

Chris Zach cz at
Fri Jan 8 19:16:41 CST 2021

True, however SIMH has to write things to a "real" file that emulates 
something of a disk. In this case I'm guessing it writes more as a super 
powered RQDX2 in that the first cylinders do not have the disk 
parameters and other odd stuff.

Which makes sense as the RQDX1 and 2 are simpler devices than the 3.

But as Dave pointed out, the last track on the disk is probably the bad 
block revector table. So no clue as to how the disk remaps bad blocks, 
but I don't think any of them were bad.

I'll put the image up on iguana tonight. If it's a blank system then 
someone can fiddle around with it a bit.


On 1/8/2021 2:57 PM, Eric Smith wrote:
> On Thu, Jan 7, 2021 at 7:38 PM Chris Zach via cctalk 
> <cctalk at <mailto:cctalk at>> wrote:
>     Oddly enough SIMH seems to read a raw RQDX1/2 disk pretty well.
> That's good to know, but not really all that odd. Arguably the main 
> purpose of MSCP was to abstract away drive and controller differences.

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