[Simh] Fwd: Re: Ultrix TK50

[Jörg Hoppe]

Bob,

>  There's clearly some sort of problem.  I would like to know whether
>  this is a general problem with magtapes under Ultrix (V3 or V4), just
>  TMSCP tapes, or just with the TK50?  So:
>
>  1. Will Ultrix install from the 3.0 tape if the simulated tape is a
>  TSV11 (different tape)? a TK70 or TU81 (different TMSCP)?
I installed my Ultrix v3 and v4 from TK50 tape, it seemed OK.
I have no installation tapes with TSV11 boot loader ... test not possible.
>  2. Will Ultrix read the 3.0 if the simulated tape is a TSV11
>  (different tape)? a TK70 or TU81 (different TMSCP)?
- I repeated the "mt rewind /mt fsf 13 /dd , dd" tests with "set tq
TU81": same errors on Ultrix v3 and v4
as with TK50.
- I tested "setld -x" with TSV05 for two different tapes each on ultrix
v3 and v4: always OK.
The other test ("mt rewind /mt fsf 13 ...") did not work for TSV05, this
tape drive seems to ignore positioning commands.

Conclusion: it is a TMSCP problem on Ultrix ... in pdp11_tq.c

Possible explanation, why Ultrix installed from TK50, but some software
distribution tapes in "setld" format have errors:
The error does only show up, if there is a very small file on tape (<  5
blocks ?).
The installation tape (for example "Ultrix-32_3.0_supp.tap") contains
only bigger files.
My test tape #1 has a small file in the middle, tape #2 has a small file
at the end before EOT.

>  I think the next step would be to extract the sources for the Ultrix
>  drivers (V3 and V4) and take a look at them.
I found only sources for Ultrix 2.0 and 4.20  on the web ... do you have
3.0 and 4.0?

Test protocols are in attachement again.

Joerg


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