SYSCHK Version 1.0
Copyright (c) 1988 Terratech. All rights reserved.

This program was written to provide protection from the corruption of the
system files, be it malicious or inadvertent. However, it is specifically
targeted against the viral form of trojan programs. SYSCHK will detect the
slightest change in any of the three system files. I would recommend the
following installation procedure:

assuming that you boot drive is C

enter SYSCHK C:
and you will see something similar to the following:

C:\IO.SYS: checksum = 61278
C:\MSDOS.SYS: checksum = 24699
C:\COMMAND.COM: checksum = 30785

edit the following lines into the beginning of AUTOEXEC.BAT,
using the checksums given for your system:

SYSCHK 61278 24699 30785 C:
IF ERRORLEVEL 32 GOTO SYSCHKERR
IF ERRORLEVEL 16 GOTO FOPENERROR
IF ERRORLEVEL 2 GOTO CSUMERROR
.
.
:SYSCHKERROR
.
.
:FOPENERROR
.
.
:CSUMERROR
.
.

If you discover that any of your system files have been modified, you should
IMMEDIATELY reboot with a known safe boot disk and run the DOS command SYS or
its equivalent.

The command SYSCHK /? will provide additional information.