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1993-12-13
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Pile, Deres, Siren, Keylock
December 13, 1993
Clarence Donath
Pile, Deres and Siren were designed for fun. Install one on a friends
computer and when they press the activation key they will get an
unsuspected surprise.
Keylock allows you to lock your keyboard when you leave your computer
unattended so that someone will not inadvertently interfere with your
work.
These programs are TSR's (Terminate and Stay Resident). Once installed
they remain dormant allowing other programs to be operated as normal.
They are activated by pressing the activation key (also known as a
hotkey) that you assign during installation.
Pile, Deres and Keylock allow the installer to select a key to use to
activate the TSR. You may use most keyboard keys including those used
in conjunction with Shift, Ctrl and Alt. The only keys that cannot be
assigned are Caps Lock, Num Lock, Print Screen, Scroll Lock and Pause.
Siren works only with Shift, Ctrl and Alt. For each of the three you
are asked which of the two keys to assign to the hotkey. Shift, Ctrl
and Alt each have two keys, one on the left and one on the right side of
the keyboard. The assignments for Shift, Ctrl and Alt are additive, that
is, if you select the Shift key and the Alt key then both must be
pressed to activate Siren.
Example 1:
Shift keys. None/either/left/right [N/e/l/r]:e
Ctrl keys. None/either/left/right [N/e/l/r]:n
Alt keys. None/either/left/right [N/e/l/r]:n
This is the prompt you will get. In this example EITHER Shift key was
chosen. When the user presses either Shift key the siren will sound.
Example 2:
Shift keys. None/either/left/right [N/e/l/r]:n
Ctrl keys. None/either/left/right [N/e/l/r]:e
Alt keys. None/either/left/right [N/e/l/r]:e
In this example either Ctrl key and either Alt key was chosen. When the
user presses Ctrl AND Alt the siren will sound. This can be used to
sound the siren as the user presses Ctrl-Alt-Delete to reboot the
computer.
More than one TSR may be installed at a time. Assign different keys to
each TSR. With this feature a TSR may be assigned more than one key.
The limitation to the number of TSR's installed is the amount of memory
left available for other programs to operate properly. Each TSR uses
about 20K.
A TSR can be removed from memory, freeing all memory allocated by the
TSR. For all TSR's, the key stroke Shift-Alt-F1 will remove the TSR. You
must be at the DOS prompt to remove a TSR. Siren requires that Numlock
be off to be removed since Shift and Alt may be assigned to the hotkey.
With Numlock off, the siren will not sound.
A TSR cannot be removed when an unknown TSR (other than Pile, Deres,
Siren or Keylock) is installed afterwards. Once the unknown TSR is
removed then Pile, Deres, Siren and Keylock may once again be removed
with Shift-Alt-F1.
Pile and Deres will not work in applications that use graphics. They
are designed to affect only text screens. Siren and Keylock will work in
applications that use graphics.
A TSR may be installed from AUTOEXEC.BAT. The activation key may be
specified as a command line parameter. The parameter is a number
containing the key's scan code in the high byte and the ASCII character
in the low byte. A list of activation key numbers is included at the
end of this file.
Example:
Deres $48E0
or
Deres 18656
The Up Arrow is used as the activation key.
Siren requires a different parameter for specifying a hotkey since it
uses only modifier keys. The number consists of a byte with the Shift
keys specified in bits 1 and 2, the Ctrl keys in bits 3 and 4, and the
Alt keys in bits 5 and 6.
The following are examples of hotkey values for Siren:
2 - left Shift key
3 - either Shift key
12 - either Ctrl key
48 - either Alt key
60 - either Ctrl key AND either Alt key
Example:
Siren 60
The siren sounds when the user presses Ctrl-Alt
Keylock is used to lock the keyboard. A three character password is
required to unlock the keyboard. The password is defined during
installation.
When the hotkey is pressed to activate Keylock, a sound is emitted to
indicate that the keyboard is now locked. No messages are displayed on
the screen to indicate that the keyboard is locked since Keylock may be
used in both text and graphics applications. I wanted to avoid using
graphics to keep the size of Keylock as small as possible. The three
keyboard LED's, Num Lock, Caps Lock and Scroll Lock revolve to indicate
that the keyboard is locked. While the keyboard is locked a keypress
will do nothing. However, pressing a modifier key (Shift, Ctrl and Alt)
may still work in some applications but this generally does nothing more
than bring down a menu. Mouse targets are also disabled. The mouse
pointer will still move around the screen, but clicking on an item will
do nothing. While locked, Ctrl-Alt-Delete (warm boot) is disabled. When
it is pressed a warning sound is emitted to remind the user that the
keyboard is locked and the computer will not reboot.
When the three character password is typed a different sound is emitted
to indicate that the keyboard is unlocked. The LED's no longer revolve
and the keyboard will work normally.
Keylock does not work as specified in some applications. For example,
some applications may use the mouse in a way that is not disabled by
Keylock. Keylock would have to be revised to cover these applications.
For now it is only designed for general DOS use. Test out Keylock in
all of the applications that you will be using to make sure that it is
compatible.
Keylock may be installed with the password and the activation key as
command line parameters. Enter Keylock /? from the DOS prompt for help.
When one of the parameters is excluded from the command line, the
program will prompt for the missing parameter before installing.
These TSR's were designed and tested on a 486. My goal was to learn how to
develop TSR's. If you would like a particular function in a TSR please
drop me a line. I frequent Groton, CT area BBS's and my handle is EDDATA
where aliases are allowed. I hope you find these programs fun and maybe
even useful.
The following list contains activation key values that may be used as command
line parameters when installing Pile, Deres and Keylock.
Key codes as stored in the keyboard buffer. The high byte contains the scan
code and the low byte contains the ASCII character.
Key pressed Hex Decimal
Esc $11B 283
F1 $3B00 15104
Shift F1 $5400 21504
Ctrl F1 $5E00 24064
Alt F1 $6800 26624
F2 $3C00 15360
Shift F2 $5500 21760
Ctrl F2 $5F00 24320
Alt F2 $6900 26880
F3 $3D00 15616
Shift F3 $5600 22016
Ctrl F3 $6000 24576
Alt F3 $6A00 27136
F4 $3E00 15872
Shift F4 $5700 22272
Ctrl F4 $6100 24832
Alt F4 $6B00 27392
F5 $3F00 16128
Shift F5 $5800 22528
Ctrl F5 $6200 25088
Alt F5 $6C00 27648
F6 $4000 16384
Shift F6 $5900 22784
Ctrl F6 $6300 25344
Alt F6 $6D00 27904
F7 $4100 16640
Shift F7 $5A00 23040
Ctrl F7 $6400 25600
Alt F7 $6E00 28160
F8 $4200 16896
Shift F8 $5B00 23296
Ctrl F8 $6500 25856
Alt F8 $6F00 28416
F9 $4300 17152
Shift F9 $5C00 23552
Ctrl F9 $6600 26112
Alt F9 $7000 28672
F10 $4400 17408
Shift F10 $5D00 23808
Ctrl F10 $6700 26368
Alt F10 $7100 28928
F11 $8500 34048
Shift F11 $8700 34560
Ctrl F11 $8900 35072
Alt F11 $8B00 35584
F12 $8600 34304
Shift F12 $8800 34816
Ctrl F12 $8A00 35328
Alt F12 $8C00 35840
` $2960 10592
~ $297E 10622
! $221 545
1 $231 561
@ $340 832
2 $332 818
Ctrl 2 $300 768
# $423 1059
3 $433 1075
$ $524 1316
4 $534 1332
% $625 1573
5 $635 1589
^ $75E 1886
6 $736 1846
Ctrl 6 $71E 1822
& $826 2086
7 $837 2103
* $92A 2346
8 $938 2360
( $A28 2600
9 $A39 2617
) $B29 2857
0 $B30 2864
_ $C5F 3167
- $C2D 3117
Ctrl - $C1F 3103
+ $D2B 3371
= $D3D 3389
Backspace $E08 3592
Ctrl Backspace $E7F 3711
Shift Backspace $E08 3592
Tab $F09 3849
Shift Tab $F00 3840
Q $1051 4177
q $1071 4209
Ctrl q $1011 4113
Alt q $1000 4096
W $1157 4439
w $1177 4471
Ctrl w $1117 4375
Alt w $1100 4352
E $1245 4677
e $1265 4709
Ctrl e $1205 4613
Alt e $1200 4608
R $1352 4946
r $1372 4978
Ctrl r $1312 4882
Alt r $1300 4864
T $1454 5204
t $1474 5236
Ctrl t $1414 5140
Alt t $1400 5120
Y $1559 5465
y $1579 5497
Ctrl y $1519 5401
Alt y $1500 5376
U $1655 5717
u $1675 5749
Ctrl u $1615 5653
Alt u $1600 5632
I $1749 5961
i $1769 5993
Ctrl i $1709 5897
Alt i $1700 5888
O $184F 6223
o $186F 6255
Ctrl o $180F 6159
Alt o $1800 6144
P $1950 6480
p $1970 6512
Ctrl p $1910 6416
Alt p $1900 6400
{ $1A7B 6779
[ $1A5B 6747
Ctrl [ $1A1B 6683
} $1B7D 7037
] $1B5D 7005
Ctrl ] $1B1D 6941
A $1E41 7745
a $1E61 7777
Ctrl a $1E01 7681
Alt a $1E00 7680
S $1F53 8019
s $1F73 8051
Ctrl s $1F13 7955
Alt s $1F00 7936
D $2044 8260
d $2064 8292
Ctrl d $2004 8196
Alt d $2000 8192
F $2146 8518
f $2166 8550
Ctrl f $2106 8454
Alt f $2100 8448
G $2247 8775
g $2267 8807
Ctrl g $2207 8711
Alt g $2200 8704
H $2348 9032
h $2368 9064
Ctrl h $2308 8968
Alt h $2300 8960
J $244A 9290
j $246A 9322
Ctrl j $240A 9226
Alt j $2400 9216
K $254B 9547
k $256B 9579
Ctrl k $250B 9483
Alt k $2500 9472
L $264C 9804
l $266C 9836
Ctrl l $260C 9740
Alt l $2600 9728
: $273A 10042
; $273B 10043
" $2822 10274
' $2827 10279
Enter $1C0D 7181
Ctrl Enter $1C0A 7178
Z $2C5A 11354
z $2C7A 11386
Ctrl z $2C1A 11290
Alt z $2C00 11264
X $2D58 11608
x $2D78 11640
Ctrl x $2D18 11544
Alt x $2D00 11520
C $2E43 11843
c $2E63 11875
Ctrl c $2E03 11779
Alt c $2E00 11776
V $2F56 12118
v $2F76 12150
Ctrl v $2F16 12054
Alt v $2F00 12032
B $3042 12354
b $3062 12386
Ctrl b $3002 12290
Alt b $3000 12288
N $314E 12622
n $316E 12654
Ctrl n $310E 12558
Alt n $3100 12544
M $324D 12877
m $326D 12909
Ctrl m $320D 12813
Alt m $3200 12800
< $333C 13116
, $332C 13100
> $343E 13374
. $342E 13358
? $353F 13631
/ $352F 13615
| $2B7C 11132
\ $2B5C 11100
Ctrl \ $2B1C 11036
Space $3920 14624
Insert $52E0 21216
Home $47E0 18400
Pgup $49E0 18912
Delete $53E0 21472
End $4FE0 20448
Pgdn $51E0 20960
Up Arrow $48E0 18656
Left Arrow $4BE0 19424
Ctrl Left Arrow $73E0 29664
Right Arrow $4DE0 19936
Ctrl Right Arrow $74E0 29920
Down Arrow $50E0 20704
Keypad with Numlock on. Keys used with Shift produce a value as if numlock
were off. Keys used with Ctrl produce same value whether Numlock is on or off.
/ $E02F 57391
Shift / $353F 13631
* $372A 14122
- $4A2D 18989
7 $4737 18231
Shift 7 $4700 18176
Ctrl 7 $7700 30464
8 $4838 18488
Shift 8 $4800 18432
9 $4939 18745
Shift 9 $4900 18688
Ctrl 9 $8400 33792
4 $4B34 19252
Shift 4 $4B00 19200
Ctrl 4 $7300 29440
5 $4C35 19509
6 $4D36 19766
Shift 6 $4D00 19712
Ctrl 6 $7400 29696
1 $4F31 20273
Shift 1 $4F00 20224
Ctrl 1 $7500 29952
2 $5032 20530
Shift 2 $5000 20480
3 $5133 20787
Shift 3 $5100 20736
Ctrl 3 $7600 30208
0 $5230 21040
Shift 0 $5200 20992
. Del $532E 21294
Shift Del $5300 21248
+ $4E2B 20011
Enter $E00D 57357
Ctrl Enter $E00A 57354