m4 9914

From: Jay West <jwest_at_classiccmp.org>
Date: Sat Aug 14 20:25:42 2004

John wrote...
> "fits" = ...?
>
> Might help in diagnosing...

Sorry, was a bit flustered. I had switched the card in the tape drive from a
differential to a single ended one. One of the problems apparently was my
9914 had been set to ignore settings on the card, and to use NVRAM instead.
So I changed diag 67, opt 13, bit 4 and it rescanned the card. After solving
a stupid (on my part) termination problem, the host now sees the drive (and
everything else on the chain, both int. & ext.) just fine.

The host can read and write data (tars, cpios, etc.) at both 800 and 1600
bpi. Any attempts to write at 3200 or 6250 fail. So... I went to
diagnostics, the confidence test (01). Here's what I get (note, the
confidence test tries 6250, 3200, 1600, 800, in that order)....

(displays 6250)
F19 Er98 (humm I thought this test was for pertec interface only)
(I hit diag and run, to continue on)
F26 Er02
(I hit diag and run, to continue on)
F29 Er02
(I hit diag and run...)
F28 Er02
(I hit diag and run... the display shows 3200 but no tape motion, then goes
immediately to 1600,
    then it moves the tape a lot, displays 800, moves the tape more, then
displays Pass98).

So it seems the unit has trouble with 6250, doesn't seem to even try 3200,
but 800 and 1600 work fine (in the diag, as well as testing from the host).

Any ideas?

Jay West
Received on Sat Aug 14 2004 - 20:25:42 BST