Re: TI-H: Expander SF

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Re: TI-H: Expander SF

ok...i know yer not the bad guy.
ive put it in and out of the socket ..to no avail.
still doesent work.


>From listown@towerguard.unix.edu.sollentuna.se Tue Nov 11 11:19:21 1997
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>From: tsaimelv@pilot.msu.edu (Mel Tsai)
>To: ti-hardware@lists.ticalc.org
>Subject: Re: TI-H: Expander SF
>Date: Tue, 11 Nov 1997 19:11:47 GMT
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>
>>all i can tell you is that i had the same problem and i also tryed it 
on 
>>several ti85's.....and it wouldent work.
>>when i asked mel he said it was a bad linkport....bullshit.
>>it was a bad chip...i bought a new chip from someone switched it with 
my 
>>old one and every thing worked great. 
>
>Then that was probably a misconnection to the chip pins.  Switch back
>the old chip and I bet you some of the pins were bent inward and
>therefore weren't fully contacting the PLCC socket.
>
>If not, then send the chip back to me and I'll prove it...
>
>I'm not trying to be the bad guy here!  I have not seen a single bad
>chip, ever.  They don't just "go bad".  When you've built over 70 of
>them yourself you'll realize this.
>
>The linkport connection is a very very crappy part of the TI-85.  If
>you use your linkport extensively, it is practically guaranteed to
>fail.  This happens to just about everybody.  Since I use the linkport
>extensively for many different things, they have failed on every TI-85
>I've used.  I know how to fix it however and I've replaced the
>linkports on seven TI-85's (3 of which were mine).  I would do this
>when my expanders suddenly "stopped working."  The slow-ass TI
>protocol can handle inductively connected loads, but the Expander
>operates 10 times faster so any slightly bad connection will screw it
>up.  I've mapped out the linkport circuit and determined some more
>possible reasons why it won't work, but I'm still researching.  
>
>Since this is such a big issue I will have a linkport failure FAQ
>about this on the release of the Expander II.
>
>-Mel
>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>-The TI-Memory Expansion Homepage
>-http://www.egr.msu.edu/~tsaimelv/expander.htm
>


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