Path: utzoo!attcan!uunet!ncrlnk!ncrcae!ece-csc!mcnc!rutgers!bellcore!tness7!texbell!bigtex!juniper!altair!markh
From: markh@altair.UUCP (Mark Hebets)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Problem using 3C503 Ethernet card
Summary: Undocumented DEVICE= option:  /m
Message-ID: <474@altair.UUCP>
Date: 5 Oct 88 18:55:38 GMT
References: <11815@emerald.BBN.COM>
Lines: 28

In article <11815@emerald.BBN.COM>, hlison@bbn.com (Herb Lison) writes:
> I'm attempting to use a 3Com 3C503 card in a PC-XT with SUN PC-NFS.  
[Stuff deleted.]
> My guess is that
> there may be a conflict with DMA channels since the 3C503 uses DMA and
> the WD does not, however I can't figure out how to disable use of DMA
> on either the hardware or software.  Anybody know this answer?

I have two suggestions:  First, be SURE that shared memory is disabled
on the board.  We have never gotten a 503 to work with PC-NFS if
shared memory was enabled.

Second, you can configure more options in CONFIG.SYS than Sun
tells you.  In the EtherLink II Installation Guide,  look on 
pages 5-6 through 5-9.  You can change the DMA channel with
a /d option (I haven't tried this) and you can force the driver
to use port I/O instead of DMA with the /m option.  We have used
/m2 and /m4 to disable DMA on some clones.  

You have to add the /m option by hand, and it will get wiped out 
if you use NFSCONF to reconfigure the Ethernet interface.

BTW, the /m option also works on the 501 card.
-- 
   Mark Hebets, Software Applications Department, Radian Corp.
   PO 201088, Austin, TX  78720     (512)-454-4797
           sun!texsun!radian!markh
       ut-emx!juniper/