AT&T 3B2/300 Technical Reference Manual page 254

FUNCTIONAL DESCRIPTION
SYSTEM OVERVIEW
General
This chapter provides a high-level functional description of the 3B2 computer to a circuit card level.
Signal names used in the diagrams and descriptions end with a "[OJ" or "[I]" to indicate an active state
of the signal. Names ending with a "O" are "active low" signals; names ending with a "1" are "active
high" signals. The term "asserted" is used in the descriptions to mean that a signal is driven to its
active state. The term "negated" is used in the descriptions to mean that a signal is driven to its
inactive state. Hexadecimal (base 16) numbers are denoted with a
Ox
prefix; for example, Ox OOA is
decimal 10.
FUNCTIONAL DESCRIPTION 3-1