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- Path: sparky!uunet!usc!sol.ctr.columbia.edu!destroyer!cs.ubc.ca!uw-beaver!newsfeed.rice.edu!rice!fontenot
- From: fontenot@ravl.rice.edu (Dwayne Jacques Fontenot)
- Subject: Re: EISA/MCA *or* Local Bus? Which is better for multitasking?
- Message-ID: <BzHxxw.F7K@rice.edu>
- Sender: news@rice.edu (News)
- Organization: Rice University
- References: <BzBx9G.Ap@utdallas.edu> <1992Dec17.231538.29868@blkbox>
- Date: Sat, 19 Dec 1992 07:53:56 GMT
- Lines: 42
-
- In article<1992Dec17.231538.29868@blkbox> rbarnett@blkbox (Rick Barnett)writes:
- >goyal@utdallas.edu (MOHIT K GOYAL) writes:
- >>Hello.
- >>I am curious as to which is better for OS/2, EISA/MCA or VL-Bus.(Vesa Local Bus)
- >>Here is my setup:
- >>single user on a stand alone pc.
- >>that's pretty much it.
- >>I will be running lotsa programs..games, word processors, Pascal, Mathcad,
- >>whatever else.
- >>Anyways, I would like to know which would offer better performance.
- >
- >EISA is 32 bits wide with bus mastering but only runs at 8 MHz. Video and
- >hard disk controller cards are few and expensive.
- >VESA is 32 bits wide with bus mastering and runs at CPU speed (up to 50 MHz).
- >A fair number of manufacturers have announced or already produce VL-Bus cards,
- >and the prices aren't much higher than the ISA versions of the same cards.
- >
- >>Also, does it even matter? (ie-if EISA/MCA is much better, will it matter?
- >>will I ever make full use of Local Bus, or vice versa?)
- >>I plan on having a scsi-2 hard drive and a scsi cd rom.
- >
- >I have seen specs on two VL-Bus SCSI controllers, with data transfer rates
- >up to 66 MBytes per second - since SCSI-2 maximum is 10 MB/sec, you can hang
- >a few drives on it without saturating the I/O channel.
-
- This all makes it look like VLB is better than EISA in every way. That is just
- not true. The relevant difference here is bus arbitration. EISA has it; VLB
- does not. The original poster was asking about multitasking, for which bus
- arbitration may make a difference (I would like to hear more about this).
-
- I would say that VLB is good (cheap and fast) for video and disk on a
- single-tasking system, but that EISA is better for multitasking.
-
- >Hope this helps...
- >--
- >Blair R. Barnett u5c95@lfhp113.hso.link.com
- >Sr. Systems Engineer 522-0045@mcimail.com
- >CAE-Link Corporation rbarnett@sugar.NeoSoft.com OR sugar!rbarnett@uu.psi.com
- >Houston TX Visit Space Center Houston! Land the Space Shuttle!
-
- Dwayne Fontenot (fontenot@ravl.rice.edu)
-
-