My primary moan is those serial ports on the QL. There are 2 of them, and

only one receiving cirucit. The Rx data lines from the 2 ports are logically ORed together and fed to the receiver. You have to make sure you external device obeys the handshake lines (no matter how slowly it sends characters), something that some devices plain can't do. An 'unbuffered' modem (i.e. just about any 300 baud modem) is a device that has problems working with the QL. -tony