Re: [Simh] Error in rsx-11mplus every 5 minutes?

[Brian]

On 1/8/20 11:56 PM, Tony Nicholson wrote:
> 
> 
> On Thu, 9 Jan 2020 at 14:48, Dave Shevett  > wrote:
> 
> So being clever I tried to do this by hand with a del command:
> 
> $ DEL DU0:[1,6]SYSSCAN.TMP
> Delete file   DU0:[1,6]SYSSCAN.TMP;1            [Y/N/G/Q]? Y
> DEL -- Failed to mark file for delete
> DU0:[1,6]SYSSCAN.TMP;1 -- No such file
> Delete file   DU0:[1,6]SYSSCAN.TMP;2            [Y/N/G/Q]? Y
> DEL -- Failed to mark file for delete
> DU0:[1,6]SYSSCAN.TMP;2 -- File ID, sequence number check
> 
> It looks like the PIP command did work (no error at least)
> 
> $ PIP DU0:[1,6]SYSSCAN.TMP;/RM
> $
> 
> Why did the DEL command not work?
> 
> Also, how did you know it was in 1,6?  The error message was ???,???
> 
> 
> 
> The DCL equivalent command for removing the directory entry for this
> non-existent file is
> 
> $ SET FILE/REMOVE DU0:[1,6]SYSSCAN.TMP;
> 
> 
> Johnny already gave an explanation for why this file entry is being
> left behind when the RSX system is not shutdown properly (you should
> use the RUN $SHUTUP command). If you’re getting this error, then it’s
> also likely that there could be other errors on the system volume
> (e.g. other files may not have been closed and there could be disk
> allocation errors).
> 
> You may need to run a disk verify using the VFY program.  See the
> Volume 3A manual “RSX-11M-PLUS Utilities Manual” for details.
> 
> The full manual set for RSX-11M Plus is on bitsavers at
> http://www.bitsavers.org/dec/pdp11/rsx11/RSX11Mplus_V4.x ).
> 

You're missing one element in that URL, Tony. The correct version is

http://www.bitsavers.org/pdf/dec/pdp11/rsx11/RSX11Mplus_V4.x

(Just checked a couple of minutes ago).

Brian.
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[Simh] query about ibsys tape format

[kenr]

Could some one tell me how to interpret an output tape written on 
sysut3.bin with Fortran WRITE OUTPUT TAPE statements.


Is bcd2txta the appropriate tool to translate it to something I can dump 
with od or hexdump?


Where can I read about the tape header or record format?

I don't know very much about the tape but output from hexdump shows me 
familiar strings.

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Re: [Simh] query about ibsys tape format

[Richard Cornwell]

Hi Ken,

> Could some one tell me how to interpret an output tape written on 
> sysut3.bin with Fortran WRITE OUTPUT TAPE statements.

  Without seeing the write statements it is hard to tell. But generally
  the SYSUTx tapes are written in binary and not BCD.

> Is bcd2txta the appropriate tool to translate it to something I can
> dump with od or hexdump?

   Like I recommended in my previous email I would use listtape. The
   -b option will convert binary to ascii. Besides BCD, listtape can
   also convert CDC display code, Burroughs BCI, Univac code. 
 
> Where can I read about the tape header or record format?

  Under IBSYS each write statement will be one record. If you use
  Fortran IV under IBJOB you can group records into a block.

> I don't know very much about the tape but output from hexdump shows
> me familiar strings.

  If you want to look at the raw tapes I would recommend using P7B
  format rather then simH. If you use I7090 rather then I7094 you will
  get tapes written with correct parity. For P7B, bit 7 is the record
  mark, bit 6 is the parity (even for BCD, odd for Binary), 5-0 the
  character. SimH tape format as a 4 byte record length before and
  after each record. 

Rich


-- 
==
Richard Cornwell
r...@sky-visions.com
http://sky-visions.com
LinkedIn:   https://www.linkedin.com/in/richard-cornwell-991076107
==

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