With 2048 programmable bits, and a choice of pseudo-random binary sequences (prbs) ranging to over 1 Mbits, the 8018A Serial Data Generator is a powerful stimulator for serial digital systems and devices requiring high bit rate and fast pulses. Even preamble-data-post-amble data link patterns are feasible by combining prbs and programmed data. Useful synch outputs simplify testing by locking scope or analyzer to unique points in the data stream. For dual-channel applications, the memory splits so that the outputs have independent 1 Kbits of data. High performance output amplifier delivers clean, 6 ns pulses with repetition rates from DC to 50 Mbits/s. Output amplitude is variable up to 15 V into 50 ohms enabling the 8018A to directly drive logic circuits ranging from TTL to CMOS. Output levels for ECL are also provided.