SC-40 update

[Rich Alderson]

From: Cory Smelosky
Sent: Tuesday, April 14, 2015 5:32 PM

> I got a directory listing of the FE disk...

> .dir 40fe:[*,*,*,*,*]

>       1,1           1  <555>    8-Sep-95 40FE:   [1,1]
>       1,4           1  <755>    8-Sep-95
>       3,3           0  <700>    8-Sep-95
>       1,2           1  <754>    8-Sep-95
>       3,6           0  <766>    8-Sep-95
>       3,11          0  <700>    8-Sep-95
>       3,7           0  <700>    8-Sep-95
>       1,340         1  <754>   31-Mar-97
>    Total of 4 blocks in 8 files on 40FE: [1,1]

    [snip snip snip]

> Unfortunately...no files are accessible and I get a BUGCHK whenever I boot 
> TOPS-10 in KLH10...but this is finally some progress!

> .type 40fe:[1,340]pm.cmd
> ?Input device 40FE: file PM.CMD
> Status bits 400001
> (Device write-locked or 7-9 punch not found on binary card)

> .copy pm.cmd=40fe:[1,340]pm.cmd
> ?Input device 40FE: file PM.CMD
> Status bits 400001
> (Device write-locked or 7-9 punch not found on binary card)

> .copy dskb:[1,2]pm.cmd=40fe:[1,340]pm.cmd
> ?Input device 40FE: file PM.CMD
> Status bits 400001
> (Device write-locked or 7-9 punch not found on binary card)

Cory,

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

    $"/HOM   /$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].

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?

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).

                                                                Rich

P. S. OBTW, congratulations!!!


Rich Alderson
Vintage Computing Sr. Systems Engineer
Living Computer Museum
2245 1st Avenue S
Seattle, WA 98134

mailto:RichA at LivingComputerMuseum.org

http://www.LivingComputerMuseum.org/