Data Science XOR computer system

[Jim Battle]

(this is a copy of a message I just sent to the comp.os.cpm user group.  I'm 
relaying it here since these are the two pools of people who might have a line 
on the information I seek -- sorry to those who lurk both here and there).

I was recently given a Data Science XOR computer system, the version with four 
S-100 slots.  There is precious little information on the web -- the one web 
site with any real information gives credit to "dave coughlin" for the 
information, but the email address is no longer good.

Anyway, here is what condition it is in:

The outside of the box is all gummed up and yellow from 20 year old cellophane 
tape that was used to hold the case together (I'm not sure why the previous 
owner didn't use screws).  A 2"x4" window was put in the side of the case so 
that the serial port baud rate dip switch could be accessed (why so big a 
hole?).  The insides are pretty dusty and grungy.  There are three boards, all 
Data Science designs it seems.  One is the Z80 CPU (4 MHz), two serial ports, 
one parallel port.  The next is a 64 KB DRAM board.  The last is the disk 
controller, with connectors for 8" and 5.25" drives.  There are two 8" half 
height drives in the box.  The 50 pin cable from the controller to the drives is 
missing.  The parallel port connector is missing.

Nevertheless, after slowly powering up the system with a variac and messing with 
the baud rate settings, I get the monitor prompt.

     XOR DATA SCIENCE
     SYSTEM MONITOR
     VERS 01.85
     F800

I've figured out most of the commands from trial and error, but I'm not sure 
what the H and X commands do even though I know the parameter syntax.  I'm not 
sure how to boot (if I am ever able to get a boot disk).

Unless somebody on this list remembers this monitor, I guess I'll disassemble it 
(it is 2KB located at F800 to FFFF) and figure it out myself.  Better yet, if 
anybody has a pointer to documents or can and is willing to make a boot disk for 
me, please reply.

In the mean time, I'll work on de-gunking everything.

Thanks.