Finding LPT Port addresses with Debug

C:\>debug /? Runs Debug, a program testing and editing tool. Debug [[drive:][path]filename [testfile-parameters]] [drive:][path]filename Specifies the file you want to test. testfile-parameters Specifies command-line information required by the file you want to test. After Debug starts, type ? to display a list of debugging commands.

One of the functions Debug provides is the ability to dump memory contents to the screen -

d start_address end_address

start_address is in the form segment:offset
end_address is optional - 256 bytes displayed as default

What's all this segment:offset stuff ? - see A note on 8086/88 Memory Segmentation

C:\>debug -d 0:408 40d 0000:0400 78 03 00 00 00 00 x..... -q C:\>

So, in this example, LPT1 is at 378 Hex with LPT2 and LPT3 not present.

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last updated: 13-Mar-97 Ian Harries <ih@doc.ic.ac.uk>