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FunctionalLimits
January 22nd, 2014, 02:15 AM
Ready? Can you identify the following?

Item #1:

16942

Item #2:

16943

Item #3:

16944

kyeakel
January 22nd, 2014, 04:36 AM
#1 is IBM SLT components possibly on a printer board.
#2 unknown
#3 is a 4pi board looks like some things I worked on at IBM in the late 70's or early 80's.

Kipp

FunctionalLimits
January 22nd, 2014, 04:54 AM
Hey, IBM sent in a ringer!

I love the SLT components. They're kind of paleo-high-tech. It's hard to get much info on them, though. I can't figure out what the particular part nos. shown here were used in. The closest match I can find online is this, which is a modem:
16945

There's a great web page called "Before microprocessors" that you might like: http://ummr.altervista.org/before_microprocessors.htm
Unfortunately, it's in Italian...but there are lots of pictures!

kyeakel
January 22nd, 2014, 08:01 AM
If you look at this document you can decode what the SLT parts are.
http://bitsavers.informatik.uni-stuttgart.de/pdf/ibm/logic/SLT_Designers_Hbk_30ns_Dec65.pdf

Kipp

Chuck(G)
January 22nd, 2014, 09:00 AM
#2 appears to be a board from a Cipher QIC streamer drive. Probably QIC-02 interface, but could possibly be QIC-36.

FunctionalLimits
January 23rd, 2014, 07:55 AM
Kipp, thank you so much for that SLT link. Invaluable.

Chuck, right, I knew #2 was for one of their drives, but I had no idea which drive. How do you figure that out?

Al Kossow
January 23rd, 2014, 08:20 AM
Kipp, thank you so much for that SLT link. Invaluable.

Chuck, right, I knew #2 was for one of their drives, but I had no idea which drive. How do you figure that out?

look at the 540 manuals on bitsavers
http://bitsavers.org/pdf/cipher

it's probably QIC-02. I don't think they had terminators on the drive side of QIC-36

The third board looks more like something out of a Datamaster or Displaywriter. My guess is a memory board out of a System 23 (Datamaster)

Chuck(G)
January 23rd, 2014, 08:33 AM
Well, 50 pin edge connector says either SCSI or QIC interface--the key in the connector says QIC. It's not a 525 with 8" floppy interface, as the component and connector layout doesn't match the one I have. So, given the age, it might be a 540. Looking around on the web, the photo of a 540 (http://computermuseum.uwaterloo.ca/items/show/351) seems very close to your board, but no match. It looks as if your board is somewhat later.

My guess would be a Cipher 640, but I can't find a photo of the PCB online. It could also be a different version of the 540, I suppose.