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echo: lan
to: ROY J. TELLASON
from: MIKE BILOW
date: 1997-06-09 14:02:00
subject: testing network cards

Roy J. Tellason wrote in a message to Mike Bilow:
 MB> All of the "WD*" cards have drivers and support from 
 MB> "http://www.smc.com," which bought the Western Digital 
 MB> networking line many years ago.  The WD8003 and WD8013 are 
 MB> classics that are widely respected.
 RJT> I have no web access at present,  unfortunately.
My BBS should have SMC drivers; I'll check.  Can you do FTP?
 RJT> Any particular address or IRQ settings that would make a
 RJT> good set of defaults? 
Personally, I like to put Ethernet cards at 340h and IRQ 12.  Second choices 
are 320h and IRQ 11.  The most likely conflicts are a PS/2-style 
(motherboard) mouse port on IRQ 12 and a SCSI controller on IRQ 11.  Older 
Adaptec SCSI controllers also need 330h, which conflicts with 320h.
Third choices are 300h and IRQ 10.  I try to avoid 360h because that 
conflicts with LPT1 at 378h.  I also try to avoid 300h, since that is the 
common default dumping ground for all sorts of peripherals.  IRQ 10 is also 
the only high IRQ which is available on most sound cards, so it is not a good 
place for network cards.
If your network card needs a DMA channel, prefer 5.  Low-numbered DMA 
channels (0-3) are 8-bit, while high-numbered DMA channels (4-7) are 16-bit.  
Adaptec SCSI controllers also default to DMA 5.
Memory aperture should be selected to be immediately above and contiguous 
with the video ROM.  This usually means starting the aperture at segment 
C800h.  It is always desirable to preserve the largest continguous block of 
UMB possible, and keeping the card aperture at the one end of the arena will 
do this.  It is also desirable to use the low end instead of the high end 
because of the broken way in which certain Microsoft utilities, such as 
EMM386, work.
 
-- Mike
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