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  • Joined: 05 Nov 2014
  • Posts: 256
  • Location: Auckland - NZ
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SG-1000/MkIII Expanion port
Post Posted: Wed Sep 04, 2019 9:34 am
Is any one able to tell me what pitch the pins are on the SG-1000/MkIII expansion port connectors? Is it 0.1" (2.54mm) or 0.125" (3.17mm) or something different again? Thanks!
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  • Joined: 07 Jun 2010
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  • Location: Greece
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Post Posted: Thu Sep 05, 2019 2:12 pm
Do you mean the distance between the centers of 2 pins? I checked a Mark III expansion port connector with a ruler and found 2.50mm. So, maybe a more accurate measurement would be 2.54mm.
pins.jpg (19.22 KB)
pins.jpg

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Post Posted: Thu Sep 05, 2019 5:52 pm
Measure from the left edge of the first pin to the left edge of the last pin and divide to get more accuracy.
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  • Joined: 05 Nov 2014
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Post Posted: Thu Sep 05, 2019 8:47 pm
Excellent.. thanks very much for that!
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Post Posted: Thu Sep 05, 2019 11:17 pm
I brought a sk-1100 keyboard to have a play with and wanted to start making an interface adapter for it. I just needed to know what sort of connector it was so i can make a start on the board before the keyboard arrives.

Based on your measurement its likely a 2.54mm 50 pin connector with only half the pins used and a notch/key in one spot to stop it being able to plug in the wrong way around. So thats nice and easy!

Thanks again!
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