*paing* In my Arduino project I had to also use a 10th wire (works like CTS, Clear to Send) that is driven high and low from the NC side which the Arduino needs to listen to. It tells the Arduino when the NC is ready for data, and when to hold from sending data.

*mem* Thanks for sharing. wouldn't this equate to 4,800 baud then. 8 bits/wires for every character @ 600 characters per second? So I guess the tape reader has a baud rate of 4800