A pulse generator for NMR application is described. Eighteen output channels are provided to allow use in both single and double resonance experiments. Complex pulse sequences may be generated by loading instructions into a 256‐word by 16‐bit program memory. Features of the pulse generator include programmable time delays from 0.5 &mgr;s to 1000 s, branching and looping instructions, and the ability to be loaded and operated either manually or from a PDP‐11/10 computer.