[Simh] Ultrix TK50

[Bob Supnik]

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)?
2. Will Ultrix read the 3.0 if the simulated tape is a TSV11 (different 
tape)? a TK70 or TU81 (different TMSCP)?

I think the next step would be to extract the sources for the Ultrix 
drivers (V3 and V4) and take a look at them.

/Bob

On 12/6/2010 12:00 PM, simh-request at trailing-edge.com wrote:
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sun, 05 Dec 2010 19:50:07 +0100
> From: J?rg Hoppe<j_hoppe at t-online.de>
> To: simh at trailing-edge.com
> Subject: Re: [Simh] SimH: Bugfix in VAX/PDP11 TK50 driver ... more
> 	facts
> Message-ID:<4CFBDEDF.2070001 at t-online.de>
> Content-Type: text/plain; charset="iso-8859-15"; Format="flowed"
> <snip>
> Thanks for that TMSCP doc!
>
> I spent the day testing some combinations of SimH/tape image/Ultrix version.
> - SimH: original V3.8-1 vs. my "JH-path" version
> - Ultrix installation: v3.0 vs. v4.0
> - Test tapes:
>           TAPE1 =   www.bitsavers.org/bits/DEC/vax/ultrix/3.0/Ultrix-32_3.0_unsupp.tap
>           TAPE2 =  "DEC C FOR RISC-ULTRIX TK50 (DEC 1991, AQ-PCXFA-BE ME214414).simh_tq.tk50" (own copy, call me)
>
> Results:
> 1) A real uVAX under Ultrix 3.0 can read the real "Ultrix-32_3.0_unsupp.tap" (surprise!)
>      The controller was QBUS TQK50 (M7546), the drive was TK50.
> 2) SimH can not read  "Ultrix-32_3.0_unsupp.tap" error free, neither on Ultrix v3 nor on Ultrix v4.
> 3) The TMSCP driver in Ultrix v4 is apparently different from v3:
>      The error patterns under SimH are similar, but not the same. Data loss is greater under v4.
> 4) My little hack (I was so proud of it:-)) is very weak:
>      - Sure, it makes "Ultrix-32_3.0_unsupp.tap" readable under Ultrix v3, as intended.
>      - But SimH can not ">>>   boot MUA0" anymore.
>      - It does not work on Ultrix v4 with "Ultrix-32_3.0_unsupp.tap"
>      - It does not work with other tapes under Ultrix v3: Tapes with a small file before EOT fail.
>
> I attached my test setups&   protocols, if somebody likes to work with it.
>
> How would we continue from here?
>
> regards,
> Joerg
>
>
>
>
>
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