Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!ames!acornrc!bob
From: bob@acornrc.UUCP (Bob Weissman)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Another twist on DOS environment sizes.
Summary: Here's the environment size patch for MSDOS 3.30
Message-ID: <835@acornrc.UUCP>
Date: 31 May 88 03:53:37 GMT
References: <629@fxgrp.UUCP> <4598@dasys1.UUCP>
Organization: Acorn Research Center, Palo Alto, CA
Lines: 29

This is a patch to increase the default environment size for the
version of COMMAND.COM which comes with MSDOS 3.30.

Load a copy of COMMAND.COM into DEBUG, and say "U0EA3".  You'll see
several lines of code.  The interesting one is at location 0EB4 -- it's

	MOV WORD PTR[1650],000A

The 000A is the number of paragraphs COMMAND.COM allocates for the
environment by default.  You may increase the environment size from 160
bytes to, say, 384 bytes, by typing "A0EB4" and then entering

	MOV WORD PTR[1650],0018

and then saying "W" to write the file back out.  Do take the usual
precaution of running DEBUG on a copy, or at least backing up
COMMAND.COM before running DEBUG.

Disclaimer: I assume no responsibility for trashed command
interpreters; I found this patch by searching with DEBUG, not by any
inside knowledge.  MSDOS 3.30 is the only version of DOS I have
available; this instruction, or its equivalent, is doubtless in a
different place in other versions.

-- 
Bob Weissman
Internet:	bob@acornrc.uucp
UUCP:		...!{ ames | decwrl | oliveb | pyramid }!acornrc!bob
Arpanet:	bob%acornrc.uucp@ames.arc.nasa.gov