b4 at gewt.net
Wed Apr 15 13:31:22 CDT 2015
On Wed, 15 Apr 2015, Rich Alderson wrote:
> It may be that CI$ defined some bits differently in their monitor. I strongly
> suggest that you examine the (emulated?) drive using FILDDT. Start by locating
> the HOM block (which might not be where DEC would put it; I vaguely remember a
> difference between Stanford and Mike&Stewart vis-a-vis TOPS-20 file systems).
> You can that with
Could be, will look in a bit.
Could also be an error in http://abuse.mooli.org.uk/compuserve/ (what a
friend used to convert the 584-byte-sector drive to something usable in
I can copy all files in the first 132 blocks (not counting any metadata
blocks) fine. That's HOM.SYS, BATBLK.SYS, and MARSFE.SYS. I'm not the
greatest with the mathematics and whatnot - better at installing the OSes
and getting everything wired together. ;)
> $"/HOM /$w
> or 505755,,0$w
> (equivalent invocations of the word-search function. "$" is altmode = escape,
> not dollar)
> 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
> What do you mean by "I get a BUGCHK whenever I boot TOPS-10 in KLH10"? I've
> done that any number of times, and never had a BUGCHK. What specifically is
> it doing?
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,
> 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)
No responses on alt.sys.pdp10, perhaps you can wake some people up? ;)
> P. S. OBTW, congratulations!!!
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.)
> Rich Alderson
> Vintage Computing Sr. Systems Engineer
> Living Computer Museum
> 2245 1st Avenue S
> Seattle, WA 98134
> mailto:RichA at LivingComputerMuseum.org
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