cctalk Digest, Vol 1, Issue 4

Michael Thompson michael.99.thompson at
Mon Nov 3 08:52:06 CST 2014

> Date: Mon, 3 Nov 2014 15:22:28 +1100
> From: Nigel Williams <nw at>
> Subject: FCO for KDA50-Q?
> I have some Emulex SD590 drives which require a controller like the
> DEC KDA50-Q (M7164+M7165) or KDA50-QA.
> I found a KDA50-Q controller on eBay, but also discovered that the
> KDA50-Q has a rather bad (show-stopper) bug that was fixed in later
> revisions, detailed here:
> >From that description I understand I need either revision D1 or D2 of
> the M7164 module. What should I be looking for on the board that would
> indicate it has had the FCO applied? is it an option to re-program the
> 6 PROMs that appear to be involved?
> Alternatively, if anyone has the two board set (M7164 and M7165 joined
> with the 40-pin and 50-pin cables) along with the cab-kit up for sale
> I would be interested in discussing further.

Nigel, I have a KDA50 board set that I plan to install in an 11/83.
Unfortunately mine has the E101-E106 PROMs 23-078F6, 23-079F6, 23-080F6,
23-081F6, 23-082F6, 23-083F6.
I am interested to find out how to implement the FCO.

Michael Thompson

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