DEC-MS11-PB-UNIBUS-Memory

The MS11-PB UNIBUS Memory module, the first to use 64-Kbit RAMs, offers significant cost savings and compactness by providing 1 Mbyte of MOS memory on a single hex-height module, replacing four previous modules. Designed for PDP-11/44 and -11/24 processors, it enables system configurations of up to 4 Mbytes with 22-bit extended UNIBUS addressing.

Key features include:

• Enhanced Reliability: Error Correction Control (ECC) corrects single-bit errors and detects double-bit errors, with an Error Trap to prevent erroneous data use. Error information is visually displayed via LEDs.
• Compatibility: It is fully compatible with existing PDP-11/44 or -11/24 memory and operating systems.
• Performance: Improved write cycle performance for PDP-11/44 systems.
• Expandability: Its high density frees up valuable backplane slots for future options.
• Data Security: Supports an optional battery backup to protect memory during power failures.
• High Quality: Manufactured to Digital's stringent quality standards using premium dynamic MOS RAM.

The document also provides physical and environmental specifications, along with electrical and performance data like read/write cycles and access times.