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KEYLK.DOC
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1983-07-20
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Keyloc - Keyboard Lock Program
--------------------------------
Keyloc is a patch to the BIOS keyboard routine. It modifies the
operation of the Alt, Ctrl, Left Shift and Right Shift keys. It allows
one finger typing by locking those keys in their shifted state.
Normally the Ctrl, Alt, Left Shift, and Right Shift keys have to be held
down with one finger, while another finger is used to type another key.
For example, if a program requires you enter a ^P, you must hold down
the Ctrl key with one finger, then depress the "P" key with another.
When Keyloc is loaded in memory, it changes the way these keys operate.
To type in a ^P, you first type and release the Ctrl key. This locks the
Ctrl key in it's shifted state. Next the "P" key is depressed and
released. This enters a ^P. Depressing Ctrl again takes the key
from it's shifted to unshifted state.
Keyloc gives an audio signal so the user can tell when he is shifting or
unshifting a key. The first time the Ctrl key is depressed, a low tone
followed by a high tone is sounded. This signals that the key has been
put in the shifted state. The next time the Ctrl key is depressed, a high
tone followed by a low tone is sounded. This signals that the key has
been returned to the unshifted state.
Loading Keyloc Into Memory
--------------------------
The program Keyloc is loaded into memory by executing the program
KEYLOC. This can be done by typing in the name of the program, KEYLOC,
with the the file KEYLOC.EXE on the diskette in the default drive.
Keyloc remains loaded in memory until the system is rebooted. It uses
approximately 500 bytes of memory.
Which Version of Keyloc to Use
------------------------------
Because Keyloc is only a patch to a program that already exists in
the ROM of the IBM PC, it may not work if changes are made to the
code in the ROM.
There are at least 3 versions of ROM-BIOS for the IBM PC and the new
IBM XT. The original Keyloc patch worked for the first two versions,
but changes to it were required by the latest version of ROM-BIOS.
The original Keyloc is "KEYLOC.EXE". It should work if you purchased
your PC before the release of the IBM XT.
A modified version of Keyloc is "KEYLOC_3". This should work if you
have an IBM XT or an IBM PC purchased after the XT was released.
You can find out which version of ROM-BIOS you computer has by
using the DEBUG program to print out the release marker of
your ROM. Type in "DEBUG" to start the program, then type the
command "D F000:FFF5 L 8". A date will be displayed that indicates
which ROM you computer has.
"04/24/81" - Version 1, use "KEYLOC.EXE"
"10/19/81" - Version 2, use "KEYLOC.EXE"
"10/27/82" - Version 3, use "KEYLOC_3.EXE"