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From: David Zakai <zakaid99@hscbklyn.edu>
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: SCSI card
Date: Tue, 3 Sep 1996 22:05:10 -0400
Organization: SUNY Health Science Center at Brooklyn
Lines: 41
Message-ID: <Pine.SOL.3.93.960903215141.13825B-100000@bmec.hscbklyn.edu>
NNTP-Posting-Host: bmec.hscbklyn.edu
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I've read quite a bit of the hardware documentation for the
Aug 1, 1996 SNAP version and have been reading messages in this
newsgroup.
I intend to get a Pentium 166 MHz PCI computer with an EIDE
hard disk, because the card/drive combination is much cheaper,
even if I equip the computer with a separate SCSI card to run
other peripherals, like tape backup, CDROM, etc.
The issues for this additional card are:
1. Are there still significant incompatibilities when using
a PCI-based card (like Adaptec AHA-2940 or AHA-2920) instead
of ISA-based cards like Adaptec AVA-1522B ?
2. Is the performance boost significant for PCI versus ISA cards
(when PCI are double the cost) ?
3. Is there a significant performance boost when using
bus mastering versus PIO (programmed IO) Adaptec cards?
(I don't think that I shall gain much advantage for tape
backup, but the Iomega JAZ drive has a Fast SCSI2 interface.)
4. If the computer's primary drive is an EIDE disk, can one
install a SCSI card with an onboard BIOS and boot from
an external bootable device like an Iomega JAZ drive ?
(I realize that one can use a boot manager on the primary
disk, but I would prefer to put the file system on the
external drive, so I would not neet to create FreeBSD
slices on the EIDE drive.)
The primary disk will probably have Win95.
Thank you.
--
David Zakai
zakaid99@hscbklyn.edu