TRS80 Model 3 i/o connectors

From: Fred Cisin <cisin_at_xenosoft.com>
Date: Wed Oct 30 11:57:00 2002

On Wed, 30 Oct 2002, Glen Goodwin wrote:
> The ones which I can identify from the docs are a female DIN connector for
> tape i/o and a female DB25 for serial i/o. The docs also describe the
> parallel port as a 34-pin card-edge connector (which I suppose needs a
> Tandy-specific cable to attach to a printer),

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)

> but the problem is that there
> are *two* of these 34-pin connectors on the rear of the system,

The other 34 pin is for external floppies. It should be possible to
identify which 34 is which by proximity to the disk controller.

> as well as
> a 50-pin card-edge connector.

"expansion bus" On the model 1 it was 40 pin. Did they change to 50 on
the 3?

> Can anyone familiar with this system help me out with details regarding
> these connectors?

I'm going from memory. It's been more than 5 years since I TRS-80'd.

--
Grumpy Ol' Fred        cisin_at_xenosoft.com
Received on Wed Oct 30 2002 - 11:57:00 GMT

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