TRS-80 video synch chaos

From: Doug Spence <ds_spenc_at_alcor.concordia.ca>
Date: Sun Jun 21 04:36:18 1998

On Thu, 11 Jun 1998, Tony Duell wrote:

> For a kludge do what I did when I had to get composite video out of a
> Model 1 without the right cable and without a soldering iron.
>
> Get a 5 pin Din to 4 RCA phono connector cable. Easy to get from (say)
> Radio Shack.
>
> Use the pin 4 plug as composite out. Short the pin 5 plug by wrapping
> wire around the pin and outer casing (this links ground, on pin 5 ,to the
> screen of all the cables, and to pin 2 on the DIN plug, which is not
> connected in the Model 1). Make sure the pin 1 plug doesn't short out -
> it's connected to the +5V line in the computer.

This works beautifully, Tony! The letters are a bit unclear in 64 columns
on my C=1802 but I suspect that would still be the case even if I had a
proper video cable. (That CHR$(23) trick for fat letters is pretty cool.)

> > Maybe somebody should take my collection away from me before I blow
> > something up. ;)
>
> I think a better solution would be for someone to donate a pile of
> service manuals to you. Not my pile though :-)

A pile of service manuals, proper tools, an education (or a brain
transplant from you or Alison), and more free time is what I need. I hate
having all these great old machines and no clue about how to fix them if
anything went wrong. :/


Doug Spence
ds_spenc_at_alcor.concordia.ca
http://alcor.concordia.ca/~ds_spenc/
Received on Sun Jun 21 1998 - 04:36:18 BST

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