[HomeBrew] Lpt port trouble

[Flowertime01 at wmconnect.com]

Ken,

If you can stand the transmitter coming on and staying on until a BAT file 
will load and execute you can write a 4 word executable machine language com 
file.
Then name the file in the autoexec.bat file. The very short program file will 
execute when called from the autoexec.bat file. You need to know some port 
addresses and the bits to place in the ports control word register.

You use basic as the tool to create the com file.
You write a basic program that
opens a file
puts the machine instructions in the file 
closes the file.
You rename the file "mything.com"
and call it from the autoexec.bat file with the command line "mything"

Not having done any of this since about 1989, I do not have the port address 
values or instruction values to stick into the file.

A slower way is to load basic with a program name from autoexec.bat. Use the 
program to out the control values to the LPT port. You use this method from 
basic to debug the program and find what you need to get into the port control 
registers.

Roger KC6TRU