Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!snorkelwacker.mit.edu!bloom-beacon!eru!hagbard!sunic!mcsun!inria!ftc!ndoduc From: ndoduc@framentec.fr (Nhuan Doduc) Newsgroups: comp.arch Subject: Re: why is 33 MHz a popular number? Message-ID: <1554@ftc.framentec.fr> Date: 30 Nov 90 10:18:48 GMT References: <1990Nov28.030500.16103@mozart.amd.com> <11214@pt.cs.cmu.edu> Sender: news@framentec.fr Lines: 12 ok, nothing magic about 33 (or really, 33.33) which is 1/30 or 25 = 1/40 or 20 = 1/50 ... but it seems that there is a reason for 4.77MHz on the good old PC : the "usual" frequency for a certain communication port is 15.31MHz, thus some other magic values: 7.16 and 9.54MHz that you may found on 8088 machines (but, *et nous sommes encore dans les valeurs magiques*, most marketing sheets and even many tech spec doc still refer to 8MHz (instead of 7.16) and 10 (instead of 9.54) --nh Nhuan DODUC, Framentec-Cognitech, Paris, France, ndoduc@framentec.fr or ndoduc@cognitech.fr, Association Francaise des Utilisateurs d'Unix, France, doduc@afuu.fr