Specifications

Glossary
prefetch Instructions are fetched and stored into a queue
on the microprocessor prior to execution in
order to optimize performance.
push A stack operation that stores one byte onto the
top of the processor stack.
RS-232-C An acronym for Required Standard 232 of the
Electronics Industry Association. Interface
standard between Data Terminal Equipment and
Data Communication Equipment, employing
serial binary data exchange.
RS-485 Standard for electrical characteristics of
hardware drivers and receivers for use in
balanced multipoint systems.
Schottky TTL Provides high speed, low noise, and compati-
bility with standard TTL. See TTL.
SCU Serial Control Unit. Single asynchronous serial
channel used for serial communication between
the CPU and a serial device external to the CPU.
space A positive voltage on a serial link.
TCU Timer/Counter Control Unit on the V40 CPU.
TTL Transistor-Transistor Logic.
VCR V40 Configuration Registers. Twelve program-
mable registers used to configure the CPU to
meet the needs of varying applications.
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