PDP-11/44 System

This manual provides comprehensive technical details for the PDP-11/44 and PDP-11X44 midrange computer systems. It covers their hardware components, configurations, operation, installation, and maintenance procedures.

Key aspects of the system include:

• A 16-bit data word processor with 22-bit memory addressing, supporting up to one megabyte of main memory.
• An 8K byte direct-mapped cache memory (KK11-B) to enhance performance.
• A KD11-Z Central Processor comprised of several hex-height and double-height modules (Data Path, Control, Multifunction, UNIBUS Interface, Console Interface) that collectively implement the PDP-11/70 instruction set, plus additional instructions.
• Memory management capabilities for address relocation and protection across 16-bit, 18-bit, and 22-bit mapping schemes, supporting multi-programming.
• A console processor (8085 microprocessor) to interpret console commands and execute diagnostic programs.
• Optional Floating-Point Processor (FP11-F) and Commercial Instruction Set Processor (KE44-A).

The manual is structured into six chapters detailing: general system and module descriptions, front panel controls and console commands, CPU backplane configuration, installation procedures (site considerations, unpacking, mounting, power, cabling), removal/replacement procedures for main units, and a detailed functional description of the KD11-Z Central Processor's logic elements. It also outlines compatible operating software systems and lists related publications for further reference.