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1986-05-29
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Int21 - MsDos Interrrupt Viewing Program
Author - Unknown
========================================
This program when invoked will display the current DOS INT 21
subfunctions invoked by COMMAND.COM and any external programs on the console.
You will see the subfunction,a verbose description of the subfunction,and
any ancillary information.
There is no best method of using this program.If you ever had a yearning
to discover what is going on,or you have a bombing or mischevious program,this
is a useful tool.I have seen the inner working of Command.com {which uses a
reserved interrupt }.You can also view how ARC.EXE operates .I have also seen
the INSTALLATION process of Microsoft Windows and now know what was going about.
In the Communcation Package Procomm 2.3, you can view the setting of four
interrupt vectors for communcation and the opening of various files. Just be
prepared for volumes of output on the standard output device.
You should have a Dos Reference to fully understand the output. Books
such as the Peter Norton Programmer's Guide to the IBM PC or Inside the IBM PC
are essential for deeper explanation.They are also less expensive than the DOS
Technical Reference {at May 1986 $100}.
Within the time period of one week, I have learned more of the MsDos
than of any literature.It is an exciting program for those who are curious
of the inner trappings of the MsDos.
Written by Adam Vazquez
Thursday May 29 1986 10:42 am
Sent to NYACC #2