MS11-PB UNIBUS Memory

The MS11-PB is a single hex-height UNIBUS memory module that offers 1 Mbyte of capacity, replacing the need for four older 256-Kbyte modules and providing significant cost and space savings. It is designed for compatibility with PDP-11/44 and PDP-11/24 systems, supporting 22-bit addressing for up to 4 Mbytes of total memory. Key features include Error Correction Control (ECC) for data integrity, an Error Trap for handling double-bit errors, and LED status indicators for diagnostic ease. The module is fully compatible with existing PDP-11 hardware and operating systems, offering performance improvements during write cycles and an optional battery backup for data security during power outages.