155-0123-00
The Tektronix 155-0123-00 (M132) is a Tek-made sweep and pickoff control integrated circuit in a 16-pin DIP, deisgned by Jim Godwin and Mike Metcalf.
It interfaces with the 155-0122-00 (M132) sweep control, the 155-0124-00 (M138) horizontal pre-amplifier, and the 155-0196-00 trigger ICs for a complete horizontal system.