Key in the following to assemble demo1, indec and outdec:
=========================================================
tasm demo1
tasm indec
outdec


Check what files have been created
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dir *.obj


Link demo1 indec and outdec
===========================
tlink demo1 indec outdec

dir *.exe

[You should now see a file called demo1.exe]

Run the program
===============
Key in demo1 and press enter to run it.
Key in 10 and press enter.
key in 20 and press enter
The program displays 30 (the result of adding 10 and 20).