WLD009.ZIP WriteLED for DOS Release 00.09 (11 Feb 2003)
WLDN009C.ZIP WriteLED Source code for DOS/NT
Content by Unal Z (original mirrored HERE). Edited by Major Tom.
WriteLED is an utility that allows you to control the LED display
present on the operator panel of all PS/2
Model 95 machines. It can be used to write a text made up of up to 8 characters
to the LED display panel. WriteLED can be used on DOS, OS/2, Windows 95/98 and
WriteLED for Windows NT requires the MCPOS driver to
operate properly. MCPOS must be started prior to the invocation of the program.
By contrast, WriteLED for DOS is a standalone DOS program and does not require
any additional drivers or utilities.
WriteLED uses the system LED display ports 108h thru 10Fh. Running WriteLED
on a machine without a LED display panel should not have any adverse effects on
the system integrity.
The 00.09 release of WriteLED provides
video effects like scrolling and blinking a text, and dumping a file to the LED
Program binaries and source code have been released for DOS and Windows NT.
The source code is common to DOS and Windows NT, where platform-dependent
sections are distinguished by the defined _WLEDDOS
variable (#undef _WLEDDOS to compile the program for Windows NT).
WriteLED is controlled through a number of command line options. To list all
options and get a help information about the command line options, run
writeled -h. To run the built-in WriteLED demo,
execute writeled -d.
Always enclose text arguments in quotation marks. Text arguments are
required by the options -o (output), -s (scroll) and -f (file). For
example, this is a valid invocation: writeled -s "ooo
Welcome to the machine ooo". When you precede your scrolling text by
seven or more spaces, the text will enter the LED display from the rightmost
The options -m (machine), -u (user) direct WriteLED to write the computer resp. user name
on the display. Only the first 8 characters can be written, longer strings will
be truncated. These options are available only in WriteLED for Windows NT.
As a special feature, WriteLED includes a file dump facility. Yes, you have
read that correctly, you can dump the contents of any file to the LED display.
Select a file to dump and run writeled -f <file
name>, then enjoy your display. All control characters and repeating
spaces in the file are intercepted and removed, resp. replaced by a single
WriteLED will fail to write to the LED display panel of
PC Server 720. The reason is that the LED display panel
of Server 720 uses a different and unknown to us display port address range.