Re: $4 Serial link problem...Help !!


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Re: $4 Serial link problem...Help !!



This is why it's recommended you buy the TI Graphlink.

At 03:38 PM 5/9/98 -0500, Steven N. Bienvenu wrote:
>I built the $4 cable design for my young son from internet schematics
>and have had problems...it transmits very poorly, and we have only been
>able to get parts of programs downloaded to his '85.  Worse, I can't
>seem to interest anyone in helping with troubleshooting.
>
>I used the ti-ti link cable and plug, and 4.7 volt diodes.
>Everything looks right x3 checks, and "ohms out" ok.
>Using it, at idle we get the proscribed -.7 volts on red and white
>wires(tip and middle of plug), but get only 3.91 volts or so on them
>when a link program is started (instead of the 4.7 volts described).
>
>His TI 85 talks to other TI's just fine, and we get the same voltage
>results with both of our available computers.
>
>I can't figure it out...I'd sure appreciate some advice...he's pretty
>disappointed.  If you have any ideas, please offer them.
>
>Best Regards,
>
>
>Steve Bienvenu
>
>bienvenu@softdisk.com   or   W5ZA@amsat.org
>
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