chkv \
		rstv - protection against viruses
		clrv /
		---------------------------------
		 Copyright ©1990 by Arthur Hagen


Most  viruses  live  in  memory  by  attaching  themselves  to  one  of the
capture-vectors  which will be called at boot-time, or by making a resident
structure  which  also will be run at boot-time.  Most virus killers handle
these  viruses nicely, and some of them even manages to find new viruses by
actively  checking  these  few  crucial places in memory.  Alas, everything
hanging  around  at these addresses need not be viruses.  E.g.  if you have
more  than one meg of chip-ram, and run 'setpatch r' for use with RAD:, two
of  the vectors will be set just to recover this.  If you use ZKick to boot
with  O/S  2.0, four of the vectors will be set.  Other utilities like some
resident  virus  killers  may also use these vectors.  So, if you include a
virus-killer  like 'VirusX' in your startup-sequence, you may actually kill
more  than  you wanted!  Here chkv, clrv and rstv come in handy.  chkv is a
small  routine  that  will list the boot-vectors to screen or any specified
file.   When  running  chkv,  note  if  you get any values shown other than
zeroes.   This  could  mean  (a)  that  you have some resident utility that
survives  reboot  or (b) that you have a virus in memory.  If you are quite
certain  that  you don't have any viruses running, use "chkv >S:Vectors" to
save  a  copy of what these vectors should be on your specific system.  Now
you  can  use rstv to actually restore these vectors to YOUR defaults after
some  virus  killer or virus have altered the contents!  Just enter "rstv",
and  the vectors will be restored, allowing you to reboot as usual.  If you
accidentally  have  rebooted  and found out that your RAD:  has disappeared
(most  probably  because of an inferior virus killer or a virus), you might
very  well  recover  your RAD:  by running rstv and then reboot.  Note that
you MUST have a file named S:Vectors that contain a list of the vectors and
their  value.   If  you don't want to restore some of the vectors, just use
any text editor to delete the line with the vector you want to leave alone.
Sometimes  you  may  want to kill off all boot-resident programs, and start
all over with a clean machine.  clrv will do this, if you just enter "clrv"
from  the  CLI.   If  you  change  your  mind, just use rstv to restore the
vectors as they should have been.


chkv  comes  in  two  flavours,  one  short and speedy, and one that should
function well even with 68020+'s with cache-ram.

For  automatic  check  at bootup, put chkv2 into the c:  directory, and the
following first in your s:startup-sequence:

chkv2 >NIL:
If WARN
	Echo "POSSIBLE VIRUS IN MEMORY!"
	rstv
	Break 1 d
Else
	Echo "Memory O.K."
EndIf

That's it!
Oh,  yeah,  the  programs are Public Domain, so you can spread them, modify
them, eat them or do whatever you like.

If you like these programs, try out VScan by the same author.

*Art