I wanted to connect a LCD Display to my parallel port and test it a
little bit, but then I realized that i was not longer able to
handle the bits in the parport by writing to 0x378.
Handling the bits of 0x37a worked fine
Its very strange.
I can only achieving the data to be on the pins if i INSTANTLY write to
If I dont do, there are random values at the pins in parbort connector
sub25 2-9 (bits 0-7)
I connected a led to bit0 and found out, that the bit always goes to 0
when my program terminates.
I have seen that the bit very often changes the state especially during
scanf input and during booting the computer and booting linux
I have tried for different io port adresses 0x378 and 0x278. I have
tried different modi in the bios(SPP, EPP, ECP) and I even tried
to change the mode by writing to the extended control register(0x378
I am sure that no system services are running any more(especially not
So I dont have any Idea whats going wrong.
Please also reply to my email
Thankx, rds Guenther
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This archive was generated by hypermail 2b29 : Tue Mar 26 2002 - 06:19:28 EST