Specifically, the plug and socket at each end.

This is a board-to-board cable from a 1989-era Toshiba laptop, which connects a dedicated modem port to the modem itself (not present in my laptop). The pinout is a very cut-down ISA bus with only a few address lines, and looks eminently suitable for hacking --- if I can find a plug which will go into the motherboard connector (I'd rather not destroy this one). But for that, I need to know what it is; the cable markings are no help. (I'm hoping to find an IDC variant.) What is it?

mysteeerious connectors

  • 2
    \$\begingroup\$ GPIB connectors were much larger than that. \$\endgroup\$
    – user16324
    Mar 6, 2017 at 21:32
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    \$\begingroup\$ Measure the pitch more accurately and see if you can find it on Digikey/Mouser. \$\endgroup\$
    – uint128_t
    Mar 6, 2017 at 22:33
  • \$\begingroup\$ Pin pitch is 0.8mm. The width of the central island is ~2mm. Mouser has about a billion different kinds of these, all very very slightly different. Incidentally, further inspection shows that that the brown end (which is either a socket or a plug) has 0179 written on it, and the black end (which is either a plug or a socket) has 0131 on it, so these are likely to be the model numbers from whoever the manufacturer is. \$\endgroup\$ Mar 7, 2017 at 20:32
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    \$\begingroup\$ the closest I've found so far: hirose.com/product/download/… \$\endgroup\$ Dec 20, 2017 at 20:19
  • \$\begingroup\$ how tall are the two (between the PCBs) when mated? "stacking height" is one of the parameters on this page:digikey.com/products/en/connectors-interconnects/… \$\endgroup\$ Dec 20, 2017 at 20:22

2 Answers 2


I know this is an old post, however has anyone looked at 3M part P50-030P-R1-EA?

The pitch is not right but the angle mounts match this series.

enter image description here enter image description here

It's likely in the same 3M P50 family https://www.3m.com/3M/en_US/company-us/all-3m-products/~/3M-Pak-50-Boardmount-Plug-P50-Series/?N=5002385+3290316870&rt=rud or similar. A high probability that 3M makes it based on the similarities.

  • \$\begingroup\$ Or rephrased to illustrate that it's likely a 3m part in the same family. A link to the family guide would make it more of an answer. \$\endgroup\$
    – Passerby
    Sep 28, 2018 at 17:55
  • \$\begingroup\$ Sorry about that. Here is a link to the P50 series.3m.com/3M/en_US/company-us/all-3m-products/~/… \$\endgroup\$
    – Robert Fay
    Sep 28, 2018 at 17:58

I think they are 30pin SCSI connectors. I have had a look around, and 30pin seems to be an odd size.

Wikipedia image - look at the bottom connector

Wikipedia article

  • \$\begingroup\$ Having worked with SCSI for decades, I know the connector in the question above is not a standard SCSI connector. It is slightly similar, but so are lots of connectors! \$\endgroup\$
    – SamGibson
    May 22, 2017 at 15:02
  • \$\begingroup\$ scale is wrong, shell shape is wrong, "centronics" same deal. \$\endgroup\$ Dec 20, 2017 at 20:29

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