Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site rna.UUCP Path: utzoo!watmath!clyde!bonnie!akgua!sdcsvax!sdcrdcf!hplabs!hao!seismo!cmcl2!rna!dan From: dan@rna.UUCP (Dan Ts'o) Newsgroups: net.micro.pc Subject: Re: Speeding up the AT Message-ID: <330@rna.UUCP> Date: Sun, 2-Dec-84 00:34:49 EST Article-I.D.: rna.330 Posted: Sun Dec 2 00:34:49 1984 Date-Received: Tue, 4-Dec-84 08:27:02 EST References: <2652@csu-cs.UUCP>Reply-To: dan@rna.UUCP ( Ts'o) Organization: Rockefeller Neurobiology, NYC Lines: 7 Summary: I believe that the PC/AT's clock is divided by three. Thus a 12 Mhz clock is really clocking the CPU and FPU at 4Mhz. 18Mhz -> 6Mhz which is better than the PC's clock (4.7Mhz ?). But the 80287 at 4Mhz is worst than the PC's 8087 at 4.7Mhz - essentially same FPU at a slower clock.