Date   : Fri, 19 Oct 1990 04:06:10 GMT
From   : wuarchive!zaphod.mps.ohio-state.edu!usc!eve.usc.edu!mlinar@eddie.mit.edu (Mitch Mlinar)
Subject: Is this a Xerox 820 micro? If so, now what?

In article <2499@ux.acs.umn.edu> hughes@ux.acs.umn.edu (Steve Hughes) writes:
>
>There is a COMM port, Printer Port (RS-232) and for God's sake,
>a DISK DRIVES port and a reset button on the back of the unit.  
>I open the case to check things out: I find a Z-80 MPU.
>The machine starts up with a beep and displays the following message:
>
>Xerox v 4.04 C 1982 Xerox Corp.
>
>     L - Load System
>     H - Host Terminal
>     T - Typewriter
>

You have a full-fledged 820-II Xerox CP/M computer which, of course,
needs disk drives (8" or 5" to work and a floppy card inside).

>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.

There is an ADM-3A compatible video there, but it is NOT just a terminal
that is widely configurable.  Have fun...


>If you do, please email me at:
>
>hughes@ux.acs.umn.edu
>

Mail bounced....


-Mitch