Hi, I am in the finishing stage of the first part of a project there a PIC16F877
is used to interface the parallell port. I am sending and reciving address and
data bytes via the parallell port in EPP v1.9 mode at 150 KB/S.
Note: Old parallell ports cant do EPP/ECP, just SPP (standard mode)

Unfortenatly I havent done the schematic yet, but this is what I use in short
for EPP bidirectional mode:
8 databits PIC <- inline resistor 470ohm -> P.port
3 handshake signals PIC <- inline resistor 1000ohm -> P.port
1 handshake signal OC PIC <- pullup 10k & inline resistor 1000ohm -> P.port

I dont know in which mode you are using the port but a few gotcha for EPP are
- u must ACK in less than 10uS
- watch out for the small difference between v1.7 and v1.9
- check and reset (if needed) the timeout flag
- init the port correctly

Also check out this site http://www.beyondlogic.org

/PJ

----- Original Message -----
From: "Wade Carpenter"
> I am trying to interface to the parallel port, and I am having no luck -
> absolutely none.
> 1) Outputs are open collector type.
> 2) Pin configuration of the port.

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