Path: utzoo!attcan!uunet!zaphod.mps.ohio-state.edu!pacific.mps.ohio-state.edu!tut.cis.ohio-state.edu!husc6!spdcc!mirror!pallio!dg From: dg@pallio.UUCP (David Goodenough) Newsgroups: comp.os.cpm Subject: Re: Is this a Xerox 820 micro? If so, now what? Message-ID: Date: 23 Oct 90 00:56:20 GMT Lines: 41 In article <27614@usc.edu> mlinar@eve.usc.edu (Mitch Mlinar) sez: >In article <2499@ux.acs.umn.edu> hughes@ux.acs.umn.edu (Steve Hughes) writes: >>Baud [B/A] >>Looks like I could type "baud 1200" or something like that, right? >>Thats what I thought, no dice. There appear to be other monitor commands, > > No. You would THINK it should do that, and I agree. However, Xerox > uses a hardware chip to set baud rate which takes a 4-bit value. > Xerox did not map this, so Baud rate works with values from "0" to "F". > > Now, if memory serves me right, "5" is 300 baud, "7" is 1200 baud, "E" (or > is it "D") is 9600 baud. I don't remember all the others in between, but > you get the idea. Obviously, don't use the quotes, just the letter/number. Hummm - this got me to thinking about the QTERM patch for a Kaypro, which is based on the "good 'ol" Ferguson Big Board [1], just like the Xerox 820 was. So I pulled the baud rate table from the Kaypro patch, and guess what: b38400: db 0,no ; 38400 baud b19200: db 0xf,yes ; 19200 b9600: db 0xe,yes ; 9600 b4800: db 0xc,yes ; 4800 b2400: db 0xa,yes ; 2400 b1200: db 7,yes ; 1200 b600: db 6,yes ; 600 b300: db 5,yes ; 300 baud Yup. 5 is 300, 7 is 1200, and e is 9600. Try the others in between, and let us know what happens. Enquiring minds want to know! [1] I don't know the _EXACT_ history of the Big Board, Kaypro, and Xerox machines, but the QTERM patches for these are as close to identical as makes no difference. I remember hearing that they all started from a common ancestor, I'm only 99% sure it was the Big Board (version 2 I think). If anyone wants to provide a full history feel free to correct what I've said above. -- dg@pallio.UUCP - David Goodenough +---+ IHS | +-+-+ ..... !harvard!xait!pallio!dg +-+-+ | AKA: dg%pallio.uucp@xait.xerox.com +---+