Hello!,

I have tried to use the parallel port under Linux and I cannot. It always leaves with the error: 216 "General Protection fault". I use the unit "Ports".

In order to use the parallel port under Windows assembler is due to use. In the end one ends up creating the unit "Ports" under Windows. There is another form? (WINAPI???)

(From memory:)

Under Linux and FreeBSD you usually have to be root to access ports AND ask permission with ioperm. See units manual, linux unit, function ioperm and maybe also the inport<x> and outport<x> functions there.

"16. The PORTS unit
16.1 Introduction...................

Under LINUX, your program must be run as root, or the IOPerm call must be set in order to set appropriate permissions on the port access."

I run the program as root. I must use IOPerm of any way?

Program of example:
Uses ports;
begin
  Writeln(Port[$378]);
end.

On the other hand, in the documentation it says:
"11.3.68 IOperm ................

See also ioperm (2)" <-- It is an error?

Under LINUX, your program must be run as root, or the IOPerm call must be set in order to set appropriate permissions on the port access." I run the program as root. I must use IOPerm of any way?

Hmm, no, I think that the docs are correct.

Marco van de Voort ( or )

I have tried to use the parallel port under Linux and I cannot. It always leaves with the error: 216 "General Protection fault". I use the unit "Ports".

I don't know about unit ports, but I done this successfully by writing and reading directly to /dev/port device. You must write here the address and then read or write data.

Then the previous example would have functional?
If it is not thus, could put an example and include it in the manual. ?

About the error.
I talk about the part that says: "See also ioperm (2)". Since it does not lead nowhere. Perhaps they wanted to talk about to "iopl" (~>man iopl).

Gracias!

Ya sé como usar la unidad ports.

Aquí hablan sobre el tema:
http://www.linuxdoc.org/HOWTO/mini/IO-Port-Programming-2.html

Dicen que la otra forma es más rápida, pero las dos tienen sus ventajas y desventajas.

Imagino que hablas español. Verdad?