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- Path: sparky!uunet!noc.near.net!hri.com!spool.mu.edu!olivea!inews.Intel.COM!td2cad!dmarer
- From: dmarer@td2cad.intel.com (Dennis Marer)
- Newsgroups: comp.sys.intel
- Subject: Re: Overdrive for the 486/50??
- Message-ID: <BzBJrC.50H@inews.Intel.COM>
- Date: 15 Dec 92 21:01:59 GMT
- References: <8f9__KS00WB5Qu_ogq@andrew.cmu.edu> <Bz8opK.Fo2@wimsey.bc.ca> <1gjdjjINNjcq@uniwa.uwa.edu.au>
- Sender: news@inews.Intel.COM (USENET News System)
- Organization: Intel Corporation, Santa Clara, CA USA
- Lines: 27
- Nntp-Posting-Host: td2cad
-
- In article <1gjdjjINNjcq@uniwa.uwa.edu.au> msimmons@ec.uwa.oz.au (Michael Simmons - mgmt_staff) writes:
- >Isn't there a DX2, Overdrive ,whatever that has the same pinout as the dx33
- >I was told by an intel dealer that I can buy a dx2/66 (overdrive ...) and
- >plug it straight into my dx33 motherboard.
- >The clock doubling is done internal (via a PLL) to the dx2/66 (overdrive etc).
- >Hence the motherboard is not required to provided a 66Mhz clock signal?
- >Maybe a dx2/66 requires the board manufacture to provided a 33/66Mhz jumper
- >where as a overdrive chip does the 33MHz to 66MHz conversion internally.
- >I have read somewhere that either the dx2 or the overdrive (?) has an extra
- >pin. What signal is on this pin? Is the rest of the pinouts/signals the same?
-
- The OverDrive and the DX2 are the same chip internally...if you buy a system
- with the clock doubling technology, you'll get a DX2. If you upgrade an
- existing system, you'll get an OverDrive. There are some pinout differences,
- and there are even two versions of the OverDrive: one for systems with the
- expansion processor socket, and one for systems without. The extra pin on
- the ODP (for expansion socket) is called the 'key' pin, presumeably to disable
- the existing processor. The ODPR (replacement part) has an identical pinout
- to the original DX processor.
-
- Dennis Marer
- dmarer@td2cad.intel.com
-
-
- P.S. I just installed an OverDrive in my 33MHz system...wheeeeeeeeee!
-
- -- Not speaking for Intel.
-