With 2048 programmable bits, and a choice of pseudo-random binary sequences (prbs) ranging to over 1 Mbits, the 8018A is a powerful simulator for serial digital systems and devices requiring high bit rate and fast pulses. Even preamble data-postamble 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. To handle patterns for repetitive tests more conveniently, data can be loaded via the option HP-IB (option 001).