LPT1 is a parallel port for a printer. It should have a DB25 labeled COM1.
After so many years, It may have a different mother board and the com port may not even be hooked up. Check the mother board. Make sure the COM headers are plugged in. There should be a cable plugged into this going to COM1.
I use a DOS version of procomm to talk to most machines. My Bridgeport R2E4 used 8 data bits, 2 stop bits, Xon Xoff enabled, no parity. Cable required pins 2 and 3 as transmit and receive, 7 as signal ground, jumper 4 to 5, and another jumper between 6 to 8 to 20.