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1993-09-04
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Documentation for Led.Exe. Last revision is 09-04-1993 for version 1.1x.
Produced by Patrick T. Wolfert, (c) Copyright 1990,1993. All Rights Reserved.
What is Led?
Led.Exe is a program which allows command-line control of the states of the
three lock keys on AT-style keyboards. It modifies bits 0, 1, and 2 of memory
location 40:17 for the scroll, num, and caps lock respectively turning the
bit on to turn the lock on or the bit off to turn the lock off. On AT keyboards
the lock settings are instantly reflected by the keyboard LEDs; For PC or XT
keyboards I think the lock setting will change but the LED status will not.
What is Led compatible with?
Led is written in the C programming language and compiled with the Microsoft
C Optimizing Compiler version 6.00AX; The executable has been targeted for
the 8086 processor meaning that it will run on any 80x86 or compatible
processor. The executable should run under IBM DOS or MS DOS versions 2 and
above or compatible. Led takes 10K bytes run-time memory and may be invoked
by other programs.
Led may be run from any Virtual DOS Machine (or DOS Box) in OS/2 1.2+. It
has been tested under OS/2 2.0 GA which allows each separate VDM to have
its own Num, Caps, and Scroll lock setting. Led also runs correctly from
DESQview which also allows individual windows to have their own settings if
configured for it.
Instructions:
Led is simple to use. Simply invoke it by name with any applicable options
on the command line. If no options are given Led will display a help message.
Usage: led [option...]
Where option is a combination of 'c', 'n', or 's' for caps, num, or scroll lock
and '+', or '-' to turn the LED(s) on or off. Off settings have precedence.
Option may be 'b' to suppress the banner or 'h' or '?' to display help. Options
may be placed in any order and may but need not be separated by a space.
Examples:
Led c+ ns- Turn caps on and num and scroll lock off.
Led ns-c+ Does the same as above.
Led n+ n- b Turns the num-lock off (off settings have precedence) and
disables display of the sign-on banner.
The Disclaimer:
This software carries absolutely no warranty whatsoever, this program
works on the author's system and is not guaranteed to work on anyone
else's system. The owner/author, Patrick T. Wolfert, will not be held
liable for any damages caused by this program to any system. If you are
in doubt as to this program's suitability for your computer system then
simply do not run it!
The License:
This program is free for non-commercial use; Any commercial use of this
program requires payment of after a reasonable trial period not to exceed
thirty (30) days. The program (Led.Exe) is distributed as shareware, meaning
that you are encouraged to try it out on your own system and to pass it along
to as many others as you would like to, but that after a reasonable trial
period, not to exceed one month of use you are required to pay for it's
continued use if used as indicated previously. Non-commercial users are
encouraged to support shareware by paying for the program if they find it a
useful addition to their computer system.
Payment is five dollars ($5) per computer which will have its keyboard status
settings modified by Led payable in United States currency/check/MO, etc...
Please remit to:
Patrick T. Wolfert
580 Main Street, Suite 1320
New York, N.Y., 10044
Multiple computer licensing information is available upon request.
Any license granted applies to all past, present, and future editions of Led.
Revision History:
04-15-90 First version for MS C 5.1.
08-21-90 1.0 Modified for MS C 6.0 and help added.
09-03-93 1.10 Corrected a help typo. Version stuff added.
Options to suppress banner and request help added.
First production version as EXE instead of COM.
Questions, Comments, Suggestions, or Criticisms?
They are all welcome, send them to me at:
Granny's Remote Bulletin Board System
(212) 371-5462 U.S. Robotics Courier HST 14.4kbps
-or-
Patrick T. Wolfert
580 Main Street, Suite 1320
New York, N.Y., 10044
Hopefully Led can help to make using your computer more efficient and
enjoyable than it otherwise would have been.
Copyrights, Trademarks, and other protections:
IBM DOS is property of IBM Corporation.
IBM OS/2 is property of IBM Corporation.
MS DOS is the property of MicroSoft Corporation.
The MS C Optimizing Compiler is property of MicroSoft Corporation.
DESQview is property of Quarterdeck Office Systems, Inc.
The Led program is property of Patrick T. Wolfert.