Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!mnetor!uunet!husc6!bbn!rochester!ciaraldi
From: ciaraldi@cs.rochester.edu (Mike Ciaraldi)
Newsgroups: comp.os.cpm
Subject: Re: running DU on a CPM3 system (or MP/M!!)
Message-ID: <5022@sol.ARPA>
Date: Tue, 8-Dec-87 22:37:11 EST
Article-I.D.: sol.5022
Posted: Tue Dec  8 22:37:11 1987
Date-Received: Sun, 13-Dec-87 16:47:36 EST
References: <8712071546.AA16014@plutonium.cchem.berkeley.edu> <8712082023.AA08132@newton.arpa>
Reply-To: ciaraldi@cs.rochester.edu (Mike Ciaraldi)
Organization: U of Rochester, CS Dept, Rochester, NY
Lines: 27

In article <8712082023.AA08132@newton.arpa> bridger%rcc@RAND-UNIX.ARPA (Bridger Mitchell) writes:
>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.


Am I missing something?  The newest version of DU I have seen,
version 8.9 (from sometime in 1984), is supposed to check whether it
is running on CP/M 1.x, 2.x, or 3.x, and adjust accordingly.
For example, it uses direct BIOS calls for 1 and 2, but
uses BDOS function 50 to do its BIOS calls in 3.

Meanwhile, I am in the process of converting DU to run on my MP/M system.
Has anyone already done this?

BTW, I assume we are talking about the same "DU"--the disk utility
which lets you read, write, and modify any sector on the disk.


Mike Ciaraldi
arpa:  ciaraldi@cs.rochester.edu
uucp:  seismo!rochester!ciaraldi