SUMMARY: Sparc 10/61 watchdog resets

From: Martin Achilli (martin@mednuc.hsr.it)
Date: Wed Aug 14 1996 - 08:55:00 CDT


Hello,
        the problem turned out to be a faulty chip on the IPT Localtalk SBus board. I also decided to speed up the fans on the SS10 power supply by doing a minor modification (write to me if you need to).

My original question:
> Our most critical machine is giving up periodically with the following message:
>
> Watchdog reset
>
> it is a Sparc 10 with a SuperSparc 61 Mbus module (60 Mhz with cache), upgraded from a Sparc 10 model 20. 64Mb of RAM, 2.1Gb Conner disk, ROM Rev. 2.25, SunOS 4.1.4 with many patches, IPT Localtalk board with uShare 4.01 (Mac <> Sun services), UTP ethernet, GX SBus video

 With a colleague we discovered a faulty chip - namely a PAL16L8DCN which is a programmable logic array - by heating/cooling until the fault occured.

Electronic engineers & specialists please read this:
The board works but the chip tends to warm up considerably, and after a certain point the machine watchdog resets, If it is kept cool with extra ventilation this does not happen. I phoned RS components who were very helpful and they told me that this type of chip should not warm up much, they have in stock the PAL16L8ACN but it must be programmed.. :-{
I can't quite understand why it now warms up and gives the watchdog reset problems, the board has been working in the machine for over a year now. Do you think I can somehow read my current chip and copy the program into a new one ?

I would like to thank again the following people for having helped:

beeg@mtb.phil.mop.com (Sean Beeg)
Brad Young <bbyoung@amoco.com>
judyh@nikko.com
mike@trdlnk.com (Michael Sullivan)
David_Gunn@lardav.com (David Gunn)
Paul Kanz <paul@icx.com>
rauthenberg@HHI.DE (Stefan Rauthenberg)



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