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From: ralf@b.gp.cs.cmu.edu (Ralf Brown)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Secondary command processor w/Turbo
Message-ID: <27@b.gp.cs.cmu.edu>
Date: Wed, 29-Apr-87 09:07:39 EDT
Article-I.D.: b.27
Posted: Wed Apr 29 09:07:39 1987
Date-Received: Sat, 2-May-87 02:32:30 EDT
References: <3509@gitpyr.gatech.EDU>
Distribution: na
Organization: Carnegie-Mellon University, CS/RI
Lines: 30
Keywords: Tough


The query was how to run a second COMMAND.COM from Turbo Pascal, an answer
was given involving a "job control program".  At least in Turbo 3.0x, there
is a much simpler way (provided that you know beforehand that the
program will only need a specific amount of heap and stack space).  When
compiling to a .COM file, specify the mAximum heap space to be the maximum
your program will need.  When the .COM file is run, Turbo releases any
memory beyond the maximum heap size back to DOS.  Then simply run COMMAND
by executing an INT 21h function call 4Bh (though you should check first
to make sure there is enough RAM for COMMAND and whatever you want to do
from within COMMAND.

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| ARPA:  RALF@B.GP.CS.CMU.EDU            "Teaching COBOL ought to be          |
| AT&T:  (412) 268-3053 (school)          regarded as a criminal act"         |
| Snail: Ralf Brown                           --- Edsger Dijkstra             |
|        Computer Science Department                                          |
|        Carnegie-Mellon University      DISCLAIMER?  Who ever said I claimed |
|        Pittsburgh, PA 15213            anything?                            |
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