Qbus cards that need ID

From: Bruce Lane <kyrrin_at_bluefeathertech.com>
Date: Fri Mar 31 19:17:45 2000

At 18:35 31-03-2000 EST, Paxton wrote:

>I have four Qbus cards that I am interested in finding out what they are.
>
>One is a Micro Technology QTS25. It has a 50 pin header. I was wondering if
>it was a SCSI card?

        QTS, IIRC, is (I'm pretty sure) a Viking Systems designation. Since Viking
made SCSI adapters for QBus and UniBus, I would consider that a likely guess.

        Couple of ways to tell. First, look around the header to see if there are
any termination resistor packs. If there are, and they have a value stamp
along the lines of '221/331,' AND there are at least two, then it is very
possible you have a SCSI board.

        Second way: Use an ohmmeter to check continuity between a known ground
point and the even-numbered pins on the header. If it is a SCSI connection,
all the even-numbered pins (with the exception of pin 26) will be grounded
(and pin 26 will be tied to +5V, probably).

>The second is an Emulex QD331040100 Rev. J. This has a 60 pin header and two
>26 pin headers. I was wondering if this was a SMD drive controller?

        Right the first time. It can handle two drives.

>The third is a Dilog DQ696-20.vThis has a 34 pin header and two 20 pin
>header. My guess is that it is a MFM or ESDI hard drive controller.

        Your second guess is correct. It's ESDI. Up to four drives, IIRC.

>In the same group of cards is a DEC M7546 which I believe is a TK50 tape
>drive controller. Why is it called a Maya Controller?

        No idea, but you're correct again. The official designation is TQK50.


-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Bruce Lane, Owner and head honcho, Blue Feather Technologies
http://www.bluefeathertech.com // E-mail: kyrrin_at_bluefeathertech.com
Amateur Radio: WD6EOS since Dec. '77
"Our science can only describe an object, event, or living thing in our
own human terms. It cannot, in any way, define any of them..."
Received on Fri Mar 31 2000 - 19:17:45 BST

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