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BootX3.30.doc
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BootX3.30.doc
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1994-10-31
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320 lines
BootX v3.30 User Manual
February 7, 1990
Requires the arp.library
The BootX package consists of:
BootX3.30 The program file
BootX.BBLib The BootX bootblock library
BootX3.30.doc This file
Note that the BootX.BBLib file is not required to run the program. See
further.
This documentation will always be updated at the top. Users of previous
versions of BootX need only to read the paragraph reflecting the changes
since their last version.
Changes from BootX v3.30 (The big one)
--------------------------------------
- Fixed a bug in the font name. BootX should now always use the Topaz 80
font (Hopefully).
- Fixed a bug in the startup code.
- Optimized the code completely
- BootX now checks for viruses on startup
- Completely rewrote the MemoryCheck routine
- All information is now printed using a console (Now I can use formated
output for several functions. For the Amiga programmers: I understand
the RawDoFmt() function now (at last)).
- Completely rewrote the link virus check routine. It can be stopped by
pressing the left mousebutton.
- BootX tries to reconise a bootblock that is loaded.
- Added checks for PVL Virus Protector 6.5 and Anti-Virus 2.0 and added
both to the built-in bootblocks.
- Removed some of the spelling errors from this doc file
Changes from BootX v3.2
-----------------------
- Fixed a bug in the new recognition routine.
Changes from BootX v3.1
-----------------------
- Some internal code optimizations.
- Added Anti-Virus 1.0 from Peter Stuer.
- Finally removed the NorthStar 2 bootblock from the installable bootblocks.
Changes from BootX v3.0
-----------------------
- Reformated this doc file so it can be read from the CLI using type.
- The detection on/off switch now flashes when it is selected.
- Added a new bootblock to the recog list.
- Added my own viruschecker to the installable bootblocks:
Thor Anti-Virus v1.0
When you boot a disk with this bootblock, it first checks the ExecBase
vectors that are most likely to change when a virus installs itself.
For the programmers among you: ColdCapture, CoolCapture (WarmCapture
isn't supported in KickStart1.2 and 1.3), KickMemPtr, KickTagPtr and
KickCheckSum. OldOpenLibrary (IRQ Virus) and PutMsg or DoIO are not
checked because these vectors are reset upon booting. When nothing
suspicious is found, a title picture is shown signaling everything is
OK. You can either wait or click the left mousebutton to continue.
When Thor Anti-Virus v1.0 finds something in the above mentioned vectors
the screen flashes red for a short period. It is up to you to react
within this period and click the right mousebutton. When you NOTHING is
changed and all vectors are left alone. I put in this option because
some programs (TurboPrint, ATool) use these vectors to stay resident.
Note that there is no way telling wheter there is a virus in memory or
some useful resident code. When you don't press the right mousebutton,
Thor Anti-Virus resets ExecBase and TRASHES any code found in the
Resident vectors. I found this the only effective way of killing a
Resident structure in this little code. I know its not pretty but its
damn effective !!! The Amiga then resets as if nothing happened.
Normally you should only get the title screen then. Thor Anti-Virus
v1.0 works completely legally, that is reserving memory for its screen
and structure, so it should be compatible with KickStart 1.3 and 1.4(?).
I have not had a chance to try this out. If you have any problems
please let me know.
Short introduction
------------------
BootX v3.30 is an attempt to make the ultimate viruskiller. BootX v3.30
is fast (written completely in assembler), small and tries to be as user
friendly as possible (use of the arp.library).
This program is public domain. This program can be copied by anyone
except for commercial use as long as this documentation file and the
program icon accompanies the program. Note that this program requires
the Arp library to run. No source code accompanies this program for the
obvious reason that everybody would be able to change the checking
algorithm.
The information contained in BootX v3.30 and this doc file is far from
complete. The author is not responsible for any mistakes about what
follows.
Thor
How to start BootX v3.30
------------------------
BootX v3.30 (from here on referred to as BootX) was written be used both
beginners and experienced users. BootX can be started both from CLI and
the Workbench.
Starting BootX from the CLI
To start BootX from the CLI simply type:
1> BootX3.30
followed by a return. This loads the BootX program and starts it.
BootX then detaches itself from the CLI. This means that you can start
BootX, bring the Workbench screen back to the front and then close the
CLI window with the EndCLI command.
Starting BootX from the WorkBench
This is the easy part. Simply click on the accompaning icon and BootX
starts.
How to use BootX v3.30
----------------------
A lot of viruscheckers and viruskillers are already written for the
Amiga but none of them offered all the features I needed. Hence the
various disk offering several different programs for doing the job.
Enters BootX.
BootX can check the bootblock of a disk, check memory for any resident
viruses and scan a disk for linkviruses. It can load bootblock libraries
for you to write on your disks as an alternative for the boring DOS Install
bootblock. It can load "brain files" so you can add any new bootblocks
that BootX does not recognise yet.
Let's start a guided tour of the screen. The main screen offers several
gadgets (I hate menus when I want to work fast). Just click the
appropriate gadget to perform an action.
Quit
Does just what the gadget says: it releases all used memory and
quits the program.
Read to buffer
This gadget explicitly instructs BootX to read the bootblock from
the current selected drive into the buffer. Normally BootX detects when a
new disk is inserted and automatically reads its bootblock. But some old 5
1/4 drives don't support automatic diskchange. This gadget can also be
used to read the bootblock after another programs has modified the
bootblock.
Write to buffer
Here you instruct BootX to write the bootblock currently in the
buffer to the selected drive. BootX maintains a buffer that holds the last
read bootblock. This buffer is also visible in the large display window in
semi-ASCII form (more about this later). The buffer allows you to read a
bootblock from one disk and then copy it to another.
The 4 drivegadgets
You can connect 4 disk drives to the Amiga. BootX checks how many drives
are connected to the Amiga and installs a gadget for every one of them.
When a drive is not found the gadget will read "N/A": not available. Note
that although a drive is connected the Amiga will not recognize its
presence when it is turned off (only applicable for external drives).
Install BootBlock
Here you can write the selected built-in bootblock to the bootblock of the
current drive.
When no bootblock library is loaded only the normal Install v1.3 bootblock
is available. At startup BootX looks for a file called "BootX.BBLib" in
the directory from which BootX started. It contains several alternative
bootblocks. It is possible to load another bootblock library using the
"Load bootblock library" menuitem (see further).
Next and Previous
These gadgets show the next or the previous bootblocks in the currently
loaded bootblock library. If no library is loaded, only the normal Install
1.3 bootblock will be available. Among the bootblocks are the normal DOS
bootblock, Ralph Babel's Install2 and several others. Thanks to all groups
and programmers whose bootblock I included. Note however that when you
press Next and Previous the bootblock buffer is not updated.
BootBlock window
This window shows the name of the selected built-in bootblock.
Message window
This window reports messages and errors resulting from the various
operations.
Main display window
Shows the bootblock currently in the buffer in semi-ASCII representation.
Only the readable characters are shown. This allows you to check for
readable text signifying the nature of the bootblock when BootX reports
"Unknown bootblock".
About
Display information about BootX and the version number. Always try to get
the latest version available to have optimum virus protection.
Load from/Save to file
BootX can save the bootblock in the buffer to any valid Amiga device.
'Save to file' can be used to save the bootblocks of games, mega demos and
other programs to a separate data disk. In case of a virus attack or a bad
disk you can load the previously saved bootblock back in the buffer and
write it back to the original disk. Note: no checking is done on the
loaded bootblock. So it is possible to load f.i. the parallel.device and
write it to the boot block. This allows you to write self-made bootblock
to the disk. BootX now asks you if it should correct the bootblock
checksum when it is wrong.
Memory check
Checks the memory for any known virus ignoring all known resident virus
checkers. When BootX finds a virus it will display an Alert identifying
which virus was in memory and will try to kill it. BootX also removes any
known linkvirus from memory.
BootX also shows some important vectors from Execbase in the main
display window. These vectors are mostly altered by viruses. A normal
vector will be display in white. When BootX thinks that something is
not normal it will display the vector in white on red. Note that this
not necessarily means that there is a virus in memory. Resident
programs as f.i. TurboPrint use these vectors too. I will try to keep
BootX's knowledge base as up to date as possible. In case of doubt,
save all data and cold-start the Amiga.
Goto sleep
Closes the main BootX screen and releases as much memory as possible. A
small window on the workbench screen is opened showing that you that BootX
is still in memory. In this state BootX uses no CPU time and just waits
for you to make the window active and click in it with the menu button (the
right mouse button). Then the main BootX screen and window is opened again
and you can go on again. BootX does not unload a brain file or a bootblock
library. Also, when asleep BootX doesn't do any checking ( like VirusX
does). I did this on purpose. There is no need to continuously keep
checking every disk that is inserted. Just check them once to make sure
there virus-free.
Kill LinkVirus
This gadget pops up the file requester for you to specify a device to
search for linkviruses. In the current version this can only be a
device. Later version will support directory and file checking. When
you select OK BootX starts searching for linkviruses in any executable
file it encounters. Note that the complete disk is searched. In case
BootX finds a link virus you are given the option to remove it from the
infected file. BootX removes the linkvirus and save the file under the
same name with an extension ".bx". Currently only the IRQ and the TTV1
linkviruses are checked for.
Help
This gadget toggles the help feature. When it is turned on you can
click any gadget to get a short help message about its function. Click
Help again to turn off the help feature.
Detection on/off
This gadget works as an on/off switch. It turns off diskchange
detection. Sometimes it is not useful to have BootX read the bootblock
of every disk you insert, especially when you have a bootblock in the
buffer you wish to write to another disk. This gadget allows one drive
user to copy bootblocks.
Learn
Clicking this gadget prompts you for a name when BootX does not known the
bootblock in the buffer yet. Enter an empty string when you want to cancel
the operation. BootX then adds the bootblock to the current brain file (if
present). Else it make a brain file in memory.
I realize this documentation is brief but I made BootX to be as intuitively
as possible. BootX is updated frequently to recognize new bootblocks and
viruses.
© 1990 Thor
_
_ //
Thanks to \X/ Amiga for being the best computer ever !
Thanks to BSB for beta testing and giving useful comments.