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Talking to Hardware on a Serial Port

Zero Tolerence
in Windows

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I have hardware (a memory keyboard for an old foil stamping machine) connected to a computer ( WINDOWS XP SP2) through the serial port and would like to know if there is a way for me to send information to it. Currently we're using an old program written in DOS to do the trick, but we cannot make any modifications to it (No source code). Basically, All I need to send is a text file, but I can't seem to connect to the hardware, the DOS program has no issues connecting to it. Anyone got any suggestions that I could give a shot?

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https://fmforums.com/topic/48446-talking-to-hardware-on-a-serial-port/
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