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ZiLOG System 8000 User Manual

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USER
48
Zilog
USER
privileged
instruction
program
An
instruction
intended
for
use
pri-
marily
by
an
operating
system,
which
can
be
executed
only
in
system
mode.
In
general,
instructions
that
change
the
processor
state
or
perform
I/O
are
privileged.
A
program
(usually
synonymous
with
~
mana)
is
a
binary
file
that
performs
a
useful
function.
Program
Counter
(PC)
One
of
the
two
Program
Status
registers.
Contains
the
address
of
the
current
instruction
word.
Program
Status
Area
The
area
in
memory
reserved
for
the
starting
program
status
of
the
interrupt
and
trap
service
routines.
Program
Status
Area
Pointer
The
register
that
contains
the
starting
address
of
the
Program
Status
Area.
Program
Status
registers
prompt
pwd
register
The two
registers
(PC
and
FCW)
that
con-
tain
the
program
status.
Many
programs
print
a
prompt
on
the
ter-
minal
when
they
expect
input.
For
exam-
ple,
the
shell
prompts
for
input
with
a
percent
sign
(%).
The
lllid
command
prints
the
full
path
name
of
the
current
working
directory.
A
storage
location
in
hardware
logic
other
than
the
memory.
Bits
within
a
register
are
numbered
from
0,
with
the
least
significant
being
the
rightmost.
(See
also
byte
register,
word
register,
register
pair,
and
register
quad.)
Zilog
48

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ZiLOG System 8000 Specifications

General IconGeneral
BrandZiLOG
ModelSystem 8000
CategoryDesktop
LanguageEnglish

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