Hi, has anyone tried to write a paper tape emulator in BASIC? I've had a go in GW-BASIC, but I suspect that the implementation of the language is too slow to reliable drive the serial port - it doesn't always pick up the paper advance signal (I've tried using both CTS and DCD as inputs). Will I have to go to a machine code routine to get the fast port access? I look forward to replies. Jim. Please see our website the " Vintage Communication Pages" at WWW.G1JBG.CO.UK