Date : Tue, 23 Oct 1990 00:56:20 GMT
From : spdcc!mirror!pallio!dg@husc6.harvard.edu (David Goodenough)
Subject: Is this a Xerox 820 micro? If so, now what?
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 <rate> [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.
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