I've got one or two of these DAVONG controllers, as well as some of the
documentation. I bought them as spare parts for the Western Digital
controllers I liked better. Since they had the 8X305 and the requisite
current injection valve transistor (don't ask me about that!. . . it's
characteristic of I2L logic, I'm told.) and similar varistors, I thought the
couple of bucks for the controllers was worth it. I bought the boxes and
supplies for useful applications, though the boxes were odd enough never to
find them.
If you have questions, I may be able to help, but I've never read the doc on
these so be patient.
Dick
-----Original Message-----
From: Ethan Dicks <ethan_dicks_at_yahoo.com>
To: Discussion re-collecting of classic computers
<classiccmp_at_u.washington.edu>
Date: Saturday, April 17, 1999 6:18 PM
Subject: Ancient disk controllers
>
>The recent postings regarding old disk controllers has caused me to dig out
>one I got at Dayton many years ago. I bought it for the external box,
>something I didn't have at the time... it appears to be a SCSI card, but
>might be a SASI card.
>
>It was made by Davong Systems, Inc., a company I remember from my younger
>days. The copyright is 1982, but there are chips on it from 1983. On the
>back are numbers like 0034 REV (J1) K 310026 170. The J1 is scratched out
>and the K handwritten. The 170 is also handwritten. On the long end in
>copper is the number 11-000034 REV E.
>
>Connector J2 and J1 are together on one side of the long end (J1 is 34-pins
>with half of them grounds, J2 is 20 pins with pins 2, 4, 6, 8, 12, 16 and
20
>grounded). J3, J4 and J5 are in line on a short end, 20 pins each, similar
>ground pattern to J2. J2 through J5 appear to have connections to a
Motorola
>AM26LS32 and a TI AM26LS31 which I take to be some sort of analog chip.
>The final connector, J6 is 50 pins.
>
>J1 appears to be the control cable for an ST506 drive, J2-J5 appear to be
>data cables for talking to four drives. The interesting chips on the board
>include a N8X305N processor, some N82S181N ROMs, an N8X371N with leads
going
>right to the 50-pin connector, and five socketed WDC parts copyrighted in
1980:
>WD1100V-03, WD1100V-01, WD1100V-04, WD1100V-05 and WD1100V-12. There is a
>crystal at 20Mhz in the analog section of the board and an 8Mhz crystal by
>the processor. In the middle of the board are three vias that are labelled
>as if they are configuration pads, in an inverted-L, labelled "1", "2" and
>"3", with a "W" above them,
>
>As I said, I was told when I bought it that it was a SCSI controller. I
>remember trying to use it some years ago and not having much success. Does
>anyone have any info on this oddball?
>
>Thanks,
>
>-ethan
>
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Received on Sat Apr 17 1999 - 19:57:01 BST