Ports and Interfaces > Parallel Port

Pin 4 goes high automatically when one of the status pins connected to the GND!

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Rightia:
I have faced a strange behavior of the pin number 4!
When I connect one of the status pins to the ground, pin number 4 turns on automatically!
Does anyone know why it happens? How can I prevent  the pin 4 to be activated without my command while I am sending input via status pins?

Jan Axelson:
See if anything here helps:

http://janaxelson.com/forum/index.php?topic=662.msg2382#msg2382

Rightia:
Unfortunately, I couldn't find any helpful information about it!
Any idea how I can solve this problem?

Jan Axelson:
You've done all of these:

Set the port to SPP or PS/2 mode in the system BIOS.

Configure the data lines as outputs by writing zero to bit 5 of the control port (base address + 2).

Set DisableWarmPoll in the registry as described in my FAQ.

and you still see the problem?

Rightia:
It still doesn’t work!

- I configured the data lines as outputs.
- I disabled DisableWarmPoll in the registry. (so, it is now 00000001)
- However, I cannot find SPP or PS/2 in the system BIOS. I only have EPP+ECP, Output_Only, and Bi-Directional.
What can I do for this part?

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