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From: bridger%rcc@RAND-UNIX.ARPA (Bridger Mitchell)
Newsgroups: comp.os.cpm
Subject: Re: running DU on a CPM3 system
Message-ID: <8712082023.AA08132@newton.arpa>
Date: Tue, 8-Dec-87 15:23:30 EST
Article-I.D.: newton.8712082023.AA08132
Posted: Tue Dec  8 15:23:30 1987
Date-Received: Sun, 13-Dec-87 13:46:38 EST
References: <8712071546.AA16014@plutonium.cchem.berkeley.edu>
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The ARPA Internet
Lines: 12

DU  uses direct bios file i/o to access disk sectors.  It's an
example of a program that needs repackaging to run under cp/m 3.
To use it, get CPM2RSX (or similarly-named RSX) and use the
CP/M 3 utility to encapsulate a COM file with that RSX.

That particular RSX converts  cp/m 2.2-style direct bios io calls
to cp/m 3 calls via the dos AND provides full physical->logical
sector deblocking.

However, as noted previously, you can't just put a zcpr3 cp/m 2.2 type
command processor on the boot tracks of a cp/m 3 system and
go; it requires rebuilding the interface from the ground up.