Path: utzoo!attcan!uunet!lll-winken!lll-tis!helios.ee.lbl.gov!pasteur!ucbvax!hplabs!hpda!hpcuhb!hpihoah!bruce From: bruce@hpihoah.HP.COM (Bruce LaVigne) Newsgroups: comp.os.minix Subject: Re: AN HISTORIC MOMENT! Message-ID: <4200004@hpihoah.HP.COM> Date: 14 Jul 88 14:57:05 GMT References: <841@ast.cs.vu.nl> Organization: Hewlett Packard, Cupertino Lines: 20 > It may be that the chip actually works at higher speeds, but this is outside > the specification, at the very least. It has been a while since I worked on that chip, but I did some stuff for a terminal emulator company back in the XT days. As I remember, the bytes you actually stuff into the chip are divisors of an externally input clock. With the clock that IBM used, if you go above 9600 you start using non-integer divisors. What this means is that since you can really only use integer numbers into the chip as a divisor, you don't get 19200 but something kindof close. If the other side can handle it, fine, but IBM doesn't support it. -bruce Bruce LaVigne ARPA: bruce%hpda@hplabs.hp.com UUCP: {ucbvax,hplabs}!hpda!bruce USnail: c/o Hewlett-Packard m/s 42L8 19447 Pruneridge Avenue Cupertino, CA 95014 Phone: (408)447-6279 work