The April issue will feature the design of the HP 54645D mixed-signal oscilloscope-a new category of instrument for testing combinations of digital and analog circuitry-and several related instruments. There will also be design articles on the HP 8720D vector network analyzer, the HP E4219A ATM network impairment emulator, the HP E4214A B-ISDN user-network interface signaling test software, the HP E5050A colloid dielectric probe, the SNMP++ software for network management development, and five papers on IC design from the 1996 HP Design Technology Conference.