A mystery Intel kit

[Jon Hales]

Hi All

I'm attaching two photos of an Intel product with the code 146007-003. It's a card with:

- a set of 10 EPROMs (146396-001 to 146396-010), a couple of D8226 ICs, four 7438N ICs, a 74LS03 on a small PCB and 8 resistor packs.

- four cables.

These items are sealed with a plastic layer.

I'm reluctant to break the seal to read the EPROMs in the search for clues. The ten EPROMs are 2764s.

IF the code 146007-003 relates to Intel's numbering of publications (which is unknown, perhaps unlikely) then the date would be around 1983. The labels of the EPROMs also refer to 1983.

Any suggestions about where this set might have been used would be welcome.

Best regards

Jon

[Mark Gent]

Hi,

For what it's worth the 50 pin IDC header reminds me of SCSI-1/-2, and there is clearly an 8 bit bus running from it to a 25pin connector, which was also used for SCSI-1.  However, the pins on the 50 pin connector are off by 1 as in the SCSI standard the data line are the first 8 on a single-ended bus.

However, it could fit a SCSI differential bus as per https://www.scribd.com/document/236828446/SCSI-Internal-Pinout-Diagram-Pinouts.  Maybe an adapter kit for SCSI differential to SCSI 25pin single ended D-type with associated software update?

Best regards,

Mark

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Sent: Tuesday, 09 June 2026 10:45:22
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Subject: intel-devsys A mystery Intel kit

 

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[Mark Gent]

Which all seemed fairly plausible until I noticed that in my enthusiasm I failed to notice that pin1 is clearly on the other side of the connector, helpfully indicated with a pointer, so back to the drawing board...

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From: Mark Gent <mg11...@gmail.com>
Sent: Tuesday, 09 June 2026 11:42:01
To: intel-...@googlegroups.com <intel-...@googlegroups.com>
Subject: Re: intel-devsys A mystery Intel kit

 

[roger arrick]

It looks like the cables go like this:

• 26 pin card edge from a PCB to a cable with a DB25
• DB25 to DB25 external cable
• DB25 to 50 pin male header
• 50 pin male header to 50 pin female card edge.

Then EPROMS and terminating resistor packs and a daughter board to update an existing board.

I vote this is some sort of external disk drive upgrade, possibly even a SASI HD, but I wouldn't rule out some sort of unsupported 8" floppy format.

I also vote NOT to take it out of the packaging.  It's a pristine piece of history, whatever it is.  It's likely rare and the only one in existence.

--  Roger Arrick -- Tyler, Texas, USA -- Ro...@Arrick.com --

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From: intel-...@googlegroups.com <intel-...@googlegroups.com> on behalf of Jon Hales <jonh...@gmail.com>

Sent: Tuesday, June 9, 2026 4:45 AM

To: intel-...@googlegroups.com <intel-...@googlegroups.com>
Subject: intel-devsys A mystery Intel kit

--

[William Beech]

Guys,

In my dealings with Intel (1985-1990) I never saw them field a SCSI product in the Intel 310/320 family.  The presence of 7438s and the 50-pin cable make me think 8-inch disk drive.  Ten each 2764s and 1983 looks like some mod kit for a system like a 310/320.  Might be for the 8-inch SMB drives that were used in these systems?

Bill 

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