Section Ill. PRINCIPLES OF OPERATION
This section provides a brief explanation of processor operating principles.
The processor controls, processes, and interfaces data received from external devices. The
processor can be divided into a power section, memory section, Floating Point Unit (FPU)
section, Central Processing Unit (CPU) section, and an input/output (1/0) section. The
paragraphs to follow provide information concerning the functioning of the sections
mentioned. Additionally, the processing subsystems and bus functioning are discussed.
a. Power Section. The power section supplies the necessary dc power to run the
processor. It operates from either 115V ac (47 to 440 Hz) using a 3883 AC EMI Filter and
5617 AC Power Supply, or 20 to 36V dc using a 3884 DC EMI Filter and 5687 DC Power
Supply. Fuses F1, F2, and F3 provide overload protection when the processor is configured
for ac power operation. Fuses F4 and F5 provide protection in the dc power configuration.
b. Memory. Memory is either semiconductor or core based, as specified in the
processor configuration. The semiconductor memory size is 256k words and the core
memory size 64k words.
NOTE: FOR DC OPERATION, AC EMI FILTER (3SS3) AND POWER
SUPPLY (5617) IN PROCESSOR ARE REPLACED BY DC EMI
FILTER (3884} AND DC POWER SUPPLY (5667).