DDUtil Online Help

How-To Find a Parallel Port Address

The following procedure will help you find the address of your non-standard parallel port. Non-standard is defined as NOT being part of your basic pc's motherboard. These include add-on boards and USB to parallel adapters. If you have a pc with a parallel port as part of the mother board you DO NOT need to go through this procedure. Standard motherboard port addresses are as follows and are built into DDUtil:

• LPT1 = 378h = 888 dec.

• LPT2 = 278h = 632 dec.

• LPT3 = 27Ch = 636 dec.

• LPT4 = 26Ch = 620 dec.

• Other= E8D8h = 59608 dec. (example of non-standard)

Step 1

• From the Start button select Control Panel
• Select System
• Select Hardware
• Select Device Manager
• Expand the Ports (Com & LPT) entry

All your hardware ports will be listed there.

• Select the LPT port you want to use for your BCD device, right-click and select properties. You should see something like the following form.

• Select the Resources tab. The number you're looking for is the first address in the first row of the resource settings window.

• Next open the windows calculator (Start/All Programs/Accessories/Calculator).

• Under the View menu select Scientific.

• Select Hex as the display mode.

• Enter the number from the previous step into the calculator.

• Select Dec as the display mode. This is the number you want to enter into the Port Number box in DDUtil.

• In the DDUtil Ports tab select Other in the Parallel Port group.
• In the Port Number box enter the decimal number obtained above.
• Press the button next to the box to save the port address.

All done, see nothing to it. The good thing is you only have to do it once :-))