Re: Re: DMKDDR

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On 11/29/2010 7:46 PM, Urza wrote:
>>
> Hello,
>
> Thank you
>
> If I've correctly understood, all who use Hercules 3.0x have this problem=
?
> I'm running Hercules on Windows 7.
>
> Sense bytes show that tape needs operator intervention.  I don't know wha=
t WRI and EOC mean.
>
> I think the cause of this situation is that on real iron rewinding of tap=
e takes some time, so SIO returns with CE and maybe CUE bits set in CSW, bu=
t in Hercules tape is rewinding at once, so DE bit is set too.
> The only thing I can't understand, if it worked correctly on Hercules 2.1=
6, 2.17, 2.18; it doesn't work normally on newer versions?
>

The history of the sense an unit status being presented by a 3420/3803=20
tape unit/controler by hercules is that I changed this to reflect what=20
VM/370's CP (the hypervisor) was expecting for a rewind-unload operation.

Ultimately, VM/370 is happy with it, but for some odd reason, standalone=20
DDR isn't.

To my dismay, I have never found any appropriate documentation regarding=20
the operations of a 3420 - so I'm solely relying on some reverse=20
engineering of the CP source to determine what a 3420 status should look=20
like upon completion of a Rewind Unload CCW operation.

We're obviously missing something... Both DDR and CP should work, but we=20
might be missing a condition or misbehaving at some point. One=20
possibility is the "CUE" status. CP Expects it - and actually=20
*recognizes* that the previous operation was a Rewind Unload by checking=20
the (merged) CE+DE+CUE+UC unit status combo.

One thing that might be different is how the "CUE" status is triggered.=20
It's possible that CP expects the CUE because it does something=20
different than DDR does (which shouldn't yield a CUE).. "CUE" is usually=20
reported when a "BUSY" condition was previously reported (and possibly=20
on another device on the same CU) - and there are several conditions=20
that can trigger this.

As for the WRI (Writeable) and EOC (End of column - meaning no tape left=20
in any of the vacuum columns ?) sense bits, I doubt these are the issue..

--Ivan


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