Windows 2000 supports 3 LPT ports, LPT1, LPT2, and LPT3, by default.
You can add additional ports, up to LPT9, by using Regedt32 to navigate to:
You can see the available ports in the right hand pane.
On the Edit menu, Add Value name LPT#: as a REG_SZ data type. Leave the String empty.
NOTE: # represents a number from 4 through 9.
After exiting the Regedt32, stop and restart the Spooler service, either in the Services tool, or at a CMD prompt:
net stop spooler
net start spooler