TRS80 Model 3 i/o connectors

From: Fred Cisin <cisin_at_xenosoft.com>
Date: Wed Oct 30 19:12:00 2002

On Wed, 30 Oct 2002, Glen Goodwin wrote:
> > IIRC, #26-1401 It is basically straight through, and can be made by
> > crimping a card-edge connector on one end of ribbon cable, and a
> > "centronics" amphenol connector on the other. Sorry, but I don't
> remember
> > which direction to offset the cable (for the 34 v 36)
> Thanks, Fred. The docs give the pinouts on the card-edge, so a cable
> should be no problem.

A trivial gotcha if you're not paying careful attention:
The numbering of the connectors of the cardedge is even numbers on one
side and odd on the other. Thus 1 is opposits 2, 33 is opposite 34. But
the numbering on the "centronics amphenol" ("blue ribbon"?) is 1-18 on one
side and 19-36 on the other side.

> > The other 34 pin is for external floppies. It should be possible to
> > identify which 34 is which by proximity to the disk controller.
> Piece of cake -- thanks again.

I don't remember whether the external floppies, which are the third and
fourth floppies, are expected to be jumpered as drive 0 and drive 1, or as
drive 2 and drive 3.

--
Grumpy Ol' Fred        cisin_at_xenosoft.com
Received on Wed Oct 30 2002 - 19:12:00 GMT

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