Date   : Thu, 10 Sep 1992 14:45:40 GMT
From   : agate!usenet.ins.cwru.edu!magnus.acs.ohio-state.edu!zaphod.mps.ohio-state.edu!caen!nic.umass.edu!umassd.edu!ulowell!woods.ulowell.edu!welchb@ucbvax.Berkeley.EDU
Subject: Re: Original Digital Research CP/M 2.2 disk format.

In article <9209081334.AA01234@tmpcu.mdc.com>, curts@TMPCU.MDC.COM (Curt
Schroeder) writes:
> 
> The disk is labeled as using the "Xerox 1800" disk format.  Can anyone
out there
> tell me what utility and what equivalent format to  use to read this
(uniform,
> 22disk, etc.).  All our attempts thus far have come up dry.  A Xerox 820 can
> not read or boot this disk.

I do not have the direct answer.  However, I have something which may be of
help to you, or be useful for general info:
In the appendix for Kenneth Heyda's "MULTI-SYSTEM 180 with ZCPR2.3"
there is a list of system format parameters for about 20 manufacturers.
I will copy it to here if desired.

E.g., XEROX 820 SD has 18 sectors/track, 128 bytes/sector, and is 
(of course?) S (=single density).
XEROX 820-II DD    has 17,               256,  and (of course?) D.
There is no other Xerox listing.

-- 
Brendan Welch, UMass/Lowell, W1LPG,  welchb@woods.ulowell.edu