TI-H: TI85 link port repair & TI-80 link!!!

To: ti-hardware@lists.ticalc.org
Subject: TI-H: TI85 link port repair & TI-80 link!!!
From: "Richard Piotter" <richfiles1@hotmail.com>
Date: Tue, 24 Feb 1998 10:19:39 PST
Reply-To: ti-hardware@lists.ticalc.org

It's possible the link plug itself is damaged. Do you have a multimeter 
or continuity tester? plug the link cable into the calc with it opened 
and touch one probe to the tip of the link cable and the other probe to 
the end of the link plug. Middle ring on the tip and the middle wire on 
the link connector, and finaly, the base ring on the link to the 
connection on the plug closest to the case. All should cause the tester 
to beep or light or whatever it does. If it doesn't, then you have a 
problem. Chances are, your tip connections won't work. It may be 
possible to fix the actual plug. If you can see the inside from the 
back, push the metal forward a bit. Otherwise, you may need to replace 
it. I only have the one in my expirimental TI-80 link, so I realy can't 
help. Maybe. I have fixed links before though.
Also, is it a link plug soldered to the main board, or is there a sub 
assembly with a clear ribbon cable connecting to the main board? If the 
link is on an assembly, the ribbon cable wires are not in the same 
order. Go by the link plug, not the ribbon cable. I have a link port 
soldered onto my TI-80, but i never finnished mapping the schematic for 
it's never completed Link circuits. I'm trying to build a link port on 
the TI-80. I doubt it supports it in ROM, but you never know??? Maybe 
silent linking to a computer would be possible??? It looks like TI was 
going to put a link cable on the TI-80, but decided not to at the last 
minute. I'd like to know if anyone has the view screen version of the 
TI-80. If they do, I'd love to hear a description of what's inside!

Richard Piotter
richfiles1@hotmail.com


>I am looking for information about the possible repair of the
>link port on my TI-85.  I had the calculator for about a year before
>I realized that it was not functional, and probably never had been.
>I had attempted to link to a friends calculator once, but never got
>it to work.  I dismissed this as a fluke and forgot about it.  About a 
year ago I built a link cable for the PC, and discovered that the port
>really was dead.
>
>Does anyone have any idea how to troubleshoot this port, or what
>possible actions I can take to have it repaired?
>This calculator has been 'over clocked', the cap in what I assume
>to be the master clock replaced with a 1pf.  I don't think that this 
will
>effect the operation of the port seriously, but I thought it worth
>mentioning.

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