16 bit interface

Okay, I have a 16 bit program that runs on windows 2000 thru DOS. The program was originally written for a Tandy. Used for logging maintenance over a network. Here's the problem: I am unable to print out the data through a network connection mapped using UNC. The laser printer is connected to a central "server" computer via LPT1. I mapped to it through a router connection. The printer will print from Word, Excel, etc. It even prints from the 16 bit program, but the printout is garbled with various characters. One laptop, which was previously setup for this, successfully tells the printer to print out the correct characters. I can't find a difference. Both use Win 2k. I suspect it somehow converts the 16 bit data to work on a 32 bit printer. All other computers garble the data. Could this be a port issue? I can't seem to tweak any computer and can't find a difference in port settings. Is there a background program? I didn't check task manager. Does anyone remember what DOS is? I tried to print from DOS, but 2k is being a bitch. I wish we would upgrade our equipment! I'll buy a sixpack of your choice for the successful answer.