RichA at LivingComputerMuseum.org
Thu Apr 16 19:02:38 CDT 2015
From: Cory Smelosky
Sent: Wednesday, April 15, 2015 11:31 AM
> On Wed, 15 Apr 2015, Rich Alderson wrote:
>> Use the Tops-10 Monitor Calls Reference Manual vol. 2 from Bitsavers, to see
>> the layout of a DEC HOM block (in the tables portion of the manual). Vol. 1
>> has a good discussion of going from [1,1] to a file in a directory, and the
>> HOM block contains a pointer to [1,1].
> Hmmm. [1,1] is the ...what's the term... UFD? that I can access files
MFD (Master File Directory). It's not quite the same internally as a User
File Directory. Also found in the tables, come to think of it.
> I figured out what that was, it's an issue with the file being larger than
> an actual rp06 disk image (truncating it, setting it to an rm05,
Umm, isn't an RM05 300MB vs. 200MB for an RP06 (real unformatted capacities)?
>> If you like, we can move the discussion to the SimH list (to include Tim
>> Litt) or alt.sys.pdp10 (to include lots of other folks).
> That would get a bit offtopic for SIMH as I'm using KLH10 for this (I've
> only gotten the image to be happy with fmt=dbd9, unsure if SIMH can do the
> same conversion but I will try shortly)
SimH only knows one disk format, the one that KLH10 calls "dlw8" (little-
endian, 1 word in 8 bytes).
> No responses on alt.sys.pdp10, perhaps you can wake some people up? ;)
I'll rattle the cage.
> Oh, a heads up: the SC-40s you have can all run the newer supervisor (1.08
> instead of 1.01. I found mine passed all diags after I imaged the newer
> drive...aside from the SC-40 Exerciser of course, that's still unhappy
> with my SCSI bus.)
Vintage Computing Sr. Systems Engineer
Living Computer Museum
2245 1st Avenue S
Seattle, WA 98134
mailto:RichA at LivingComputerMuseum.org
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