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- Newsgroups: comp.sys.ibm.pc.hardware
- Path: sparky!uunet!infonode!ingr!b30news!catbyte!medin
- From: medin@catbyte.NoSubdomain.NoDomain (Dave Medin)
- Subject: Re: IBM XT processor upgrade
- Message-ID: <1992Nov10.195647.9503@b30.ingr.com>
- Sender: medin@catbyte (Dave Medin)
- Reply-To: medin@catbyte.b30.ingr.com
- Organization: Intergraph Corporation, Huntsville AL
- References: <BwEoFv.MH4@syd.dms.CSIRO.AU> <1992Oct29.201131.84@cuphub.cup.edu> <BwxBuL.Ay5@dei.unipd.it> <1992Nov9.194014.99@cuphub.cup.edu>
- Date: Tue, 10 Nov 1992 19:56:47 GMT
- Lines: 29
-
- In article <1992Nov9.194014.99@cuphub.cup.edu>, luf4695@cuphub.cup.edu writes:
-
- |> I'm pretty sure the 10% performance increase was due to the NEC V20 being
- |> faster than a 8088 and not the speed of the chip. I am almost positive that
- |> your 10MHz chip is running at 4.77MHz if you didn't also change the crystal
- |> on the motherboard. If anyone out there knows, please help. Thanks.
-
- As intimated by several other posters, you are correct. The V20 still
- runs at the same motherboard clock speed, but gains its 10 - 20%
- performance increase because of more efficient microcode. The chip's
- rated clock speed must be the same or greater than the motherboard's
- clock speed, though. I have seen V20's sold rated for 6 and 10 MHz
- operation.
-
- I've done over a dozen V20 "brain transplants" without a problem.
- The V30 transplants (for the 8086) went well, too, except I've noticed
- Norton goes crazy on the performance figures...
-
- --
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- Dave Medin Phone: (205) 730-3169 (w)
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