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- Newsgroups: comp.sys.mac.hardware
- Message-ID: <wf217sv0BwwwNPqLMq@transarc.com>
- Date: Mon, 16 Nov 1992 16:26:16 -0500
- From: Butch_Anton@transarc.com
- Subject: Re: 25MHz IIsi and my engineering friend
- In-Reply-To: <Bxs3BK.Gsr@jfwhome.FUNHOUSE.COM>
- References: <1992Nov15.121708.24693@news.acns.nwu.edu>
- <Bxs3BK.Gsr@jfwhome.FUNHOUSE.COM>
- Lines: 28
-
- jfw@jfwhome.FUNHOUSE.COM (John F. Woods) writes:
- > In <1992Nov15.121708.24693@news.acns.nwu.edu> eepmatt@casbah.acns.nwu.edu (Mat\
- > thew Friedman) writes:
- >
- > >3. He told me it is a common practice in ibm's to upgrade to a higher
- > >clockspeed simply by swapping to a new microprocessor (apparently theirs
- > >include their own timing crystals.)
- >
- > No. Intel microprocessors do *not* include timing crystals. Intel has
- > *recently* begun shipping "clock doubler" parts that internally generate
- > a microprocessor clock at twice the supplied clock frequency to enable
- > calculations to go faster, but this is a recent innovation. For some time,
- > it has been possible to buy (if I remember correctly) 286 pin-compatible
- > 386 processors that speed up a 286 system by taking fewer (slow) clock cycles
- > to perform instructions; similarly, there are not 386 pin-compatible 486
- > processors that speed up 386 systems similarly.
-
- Uhhhhh, what if he was talking about IMB's other than PC's? I believe
- that they make some larger computers, like maybe something around a
- 3090 or some such thing . . . :-)
-
- In the case of IBM-proprietary chips, I believe that the EE is correct.
-
- Butch Anton | Psycho Racing (Novice Sprints) | butch@transarc.com
- Transarc Corp. | '87 EX-500 WERA #623 AMA/CCS #811 | DoD #0124 AMA#485814
- 707 Grant ST | M&N Racing (WERA Natl. Endurance) | '83 Seca 650 Turbo
- Pgh, PA 15219 | '89 CBR-600 WERA #83 Novice | '89 FZR 600
- +1 412 338 4442 | "You have to be crazy to race this piece of shit!"
-