Good day all. I am looking for help and advice with regards to Printer Port Handshaking. I have a duel printer port PCI card based on the Moschip Semiconductor MCS9865IV-AA Chip. When the card is fitted and installed, windows see two new ECP printer ports. Both ports work fine. I need to be able to force one of the ports from ECP to SPP mode. Reading the Datasheets for the MCS9865IV-AA, it says: But now is when things get more intresting. I am not using the printer ports for any standard devices, like printers, scanners, etc. The printer ports are part of a CNC system, running Mach3 software, that uses the printer port inputs / outputs to control step and direction pulses. ECP or EPP Mode is find for sending out step and direction pulses, but does not work for input signals, for that I need to use SPP mode. So my question is: What is involved to make a SPP handshake signal to force the port from ECP to SPP mode? Can it be done with simple hardware, or will I have to use a PicAxe or Arduino microcontroller? Thanks for your time. Best Regards.