ZiLOG System 8000 User Manual page 51
Zeus operating system manual
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Also See for System 8000:
- Hardware reference manual (366 pages) ,
- Hardware reference manual (100 pages)
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USER
(
41
command
Zilog
USER
A function
performed
by
the
system,
either
by
the
shell
or
by a program
residing in a file in the ZEUS system.
context switching
CONTROL
Interrupting the
activity
in. progress
and
switching
to
another activity.
A
context switch involves saving for later
restoration
the
contents
of
the
general-purpose registers,
~he
Program
Counter and the
~
gng
Status
~.
The CONTROL key, labeled CTRL, generates
and
sends
control
instructions to the
terminal during command execution.
Any
character
typed
with
the
CTRL
key
pressed is transparent to the user,
but
is recognized by the CPU.
CPU (central processing unit)
The unit
of
a
computing
system
that
includes
the
circuits
controlling the
interpretation of instructions and their
execution.
data structure A logical organization of primitive ele-
ments
(e.g
byte
or word) whose format
and access conventions are well defined.
Examples
of data structures are tables,
lists, and arrays.
data type
The way in which bits
are
grouped
and
interpreted.
For
an
instruction, the
data type of an operand
determines
its
size
and
the significance of its bits.
Operand data types include
byte,
word,
long word, byte string, word string, and
BCD digit.
debugging
Debugging is the process
of
correcting
mistakes
in programs and shell scripts.
The shell has several options and
vari-
ables
that
can be used to aid in shell
debugging.
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41
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