On Thu, 8 Feb 2018, Eric H. Johnson wrote:
Date: Thu, 8 Feb 2018 11:51:24 -0500
From: Eric H. Johnson <ejohn...@camalytics.com>
Reply-To: "Enhanced Machine Controller (EMC)"
<emc-users@lists.sourceforge.net>
To: "'Enhanced Machine Controller (EMC)'" <emc-users@lists.sourceforge.net>
Subject: Re: [Emc-users] Mesa 7i43 TRAM error
Peter,
Voltage to the card is 4.97V. The cable length is 2'. I had a spare, but the
same length. Swapped anyway and getting basically the same thing. A PITA
because it usually takes 1-3 hours for the error to occur after a cold
start. I am not seeing anything shorter than 3' on the Mesa Price list. The
distance in the panel between the parallel port on the computer and the 7i43
is easily less than 1'. This computer still has a DB25, but the new
motherboards I have use just a female header on the motherboard side too.
There must be an adapter that goes to a female DB25.
Is 2' still too much or is the problem elsewhere?
Thanks,
Eric
It might be if there is a ground loop so there is significant high frequency
current flowing through the cable ground pins.
One thing to try is to use a very short ( 3" or so ) heavy wire between the PC
case ground and the 7I43 Ground (just as a test) to shunt any ground currents
flowing through the EPP cable.
I would check that the 7I43s 5V power is OK and maybe try a shortened EPP
cable. A TRAM error means the EPP handshake failed (sort of like the card
reset or totallly lost communications somehow )
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Peter Wallace
Mesa Electronics
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