In a message dated 98-01-01 08:13:02 EST, you write: << The outputs are TTL. You can get away without any level conversion, but you will need to invert the signals, which you can't do very easily. The best chip to use is a Maxim MAX202 - it's similar to the MAX232, but uses .1 uF caps. Leon -- >> The MAX233 doesn't require any caps at all. It is a bit pricy though. Dave Duley