Go to a DOS prompt. Type in debug at the C: prompt.
Enter in the following commands:
Blue
– what you type in.Pink
– what is displayed on the screen. (DO NOT TYPE THIS IN!)Black – this is useful information. (DO NOT TYPE THIS IN!)
To verify which communications ports are being detected:
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D 40:0 B (ENTER)0040:0000 F8 03 F8 02 00 00 00 00 78 03 00 00 ...........x...
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Q (ENTER)Com1's I/O address is written as F8 03 above. This is Debugs way of saying "I see port 03F8." Com 1 is O.K.
Com2's I/O address is written as F8 02 above. This is Debugs way of saying "I see port 02F8." Com 2 is O.K.
Com3's I/O address is written as 00 00 above. This is Debugs way of saying I don't see this port.
Com4's I/O address is written as 00 00 above. This is Debugs way of saying I don't see this port.
LPT1's I/O address is written as 78 03 above. This is Debugs way of saying "I see port 0378." LPT 1 is O.K.
LPT2's I/O address is written as 00 00 above. This is Debugs way of saying I don't see this port.