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- Newsgroups: comp.sys.intel
- Path: sparky!uunet!psinntp!fasttech!zeke
- From: zeke@fasttech.com (Bohdan Tashchuk)
- Subject: Re: Request for OverDrive technical details
- Message-ID: <1992Nov22.135356.1160@fasttech.com>
- Organization: Fast Technology
- References: <Bxz7Jo.Ip6@undergrad.math.waterloo.edu> <1992Nov21.001602.3987@ichips.intel.com>
- Date: Sun, 22 Nov 1992 13:53:56 GMT
- Lines: 21
-
- In <1992Nov21.001602.3987@ichips.intel.com> markg@pdx820 (Mark Gonzales) writes:
-
- >The OverDrive CPU does not care if the original is in place or not.
-
- Well, this isn't quite true. The CPU doesn't care, but the motherboard might.
-
- Intel would *prefer* that you left the damn thing alone. They have tried their
- hardest to muddy the waters by having three different pinouts between DX, SX,
- and OverDrive. This makes it difficult to just swap in a new chip for an old.
- The idea being that if you can't swap then you'll leave the old one alone and
- not glut the market with these pulled chips.
-
- If you remove the SX chip then you will leave some motherboard inputs
- floating. This has the potential of introducing major flakiness into the
- system. Maybe the motherboard designer anticipated this and added resistors
- to the motherboard inputs, and maybe he didn't. Considering how cutthroat the
- business is these days he probably opted to save a few pennies.
-
- In particular the HLDA output from the SX is quite important. Depending on the
- specific motherboard there could be others. Of course, you can replace the SX
- with a cheap header that has some resistors on it.
-