Path: utzoo!attcan!uunet!ogicse!ucsd!ucbvax!TXS.PITT.EDU!dth
From: dth@TXS.PITT.EDU (Daniel Holtzman)
Newsgroups: comp.protocols.tcp-ip.ibmpc
Subject: Re:  Problem with 3c503 and Zenith 386sx
Message-ID: <9007232202.AA08005@diamond.txs.pitt.edu>
Date: 23 Jul 90 22:02:48 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 25

JoAnn,

I too had problems with Zenith 386sx machines and the 3c503 cards. 
However, the 3c505 cards work just fine.

The Zenith 386sx is an AT bus machine. There are two problems that 
I know of with the older motherboards (the new ones supposedly have 
these problems corrected):

	The DMA controller for the disk controller (Western Digital 
	OEM) was not up to spec. This caused problems when I would 
	try to run FASTBACK.

	One of the signals on the AT bus is not implemented correctly. 
	I can't remember the details, but I think the 3c503 sees a 
	signal on the bus that should not be there - it then tries to 
	respond to the signal, but since it was a false signal the 
	3c503 just hangs.

Zenith now has a revision to fix these problems (and maybe others that 
I am not aware of). Just call up your Zenith rep.  I can't verify if 
the motherboard revisions work since I haven't scheduled the repairs yet.

Dan Holtzman
dth@txs.pitt.edu