There's still a few of us old OSI people hanging out here. I have
schematics for most of the OSI system boards, but I think you may have what
was called the Denver Board which I don't have any data on. You might try
checking out the track zero sensor on the drive. If you were really lucky
it might just be dirty.
----- Original Message -----
From: "Bill Allen Jr" <n8uhn_at_yahoo.com>
To: <cctalk_at_classiccmp.org>
Sent: Tuesday, November 19, 2002 7:34 PM
Subject: osi docs needed
> Hi all,
>
> after searching the archives for info on osi and m/a
> comm computers, i found this list and subbed to it.
>
> i am into mini computers and ham radio as well as most
> tech fields.
>
> currently i'm looking for info and pinouts/schems on
> the osi boards.
>
> i have some spare boards form a osi m/a-comm 220c
> and a oem of the same but am trying to get a "dbi
> db80"
> working.
>
> the db-80 uses all osi drives,powersupplies and
> boards,
> except for the two cpu/terminal/comms boards labeled
> "dbi inc db1"
>
> the comp also has a ohio memory systems 10" hard drive
> in it.
>
>
> the machine did work in the early 90's then a strange
> problem started" upon a floppy command the head would
> go to the end of the lead screw and the stepper would
> not stop!
>
> now after 6 years in storage i tried the spare boards
> on a backplane and nothing (great more work to do).
>
> i thought the drive might be bad also so i searched
> the archives on this list and read about the
> serial/parallel interface that osi used - a-ha! that
> why osi dosnt use the read data pin on the siemans
> drive.
>
> the drive did head load and step ok when i tested them
> last week and i got a good index sensor pulse so
> perhaps the controller was going.
>
> if needed i'll recap and replace all the chips on the
> cards (i hope the eproms (rom) are ok.
>
> might anyone have docs on the osi boards?
>
> or is thier any osi owners.collectors on the list
> anymore?
>
> if so i'll send the board numbers later.
>
> 73 DE N8UHN
> Bill
>
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Received on Wed Nov 20 2002 - 19:11:00 GMT