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ZiLOG System 8000 User Manual

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USER
42
diagnostic
Zilog
USER
An
error
message
produced
by a
program
is
often
referred
to
as
a
diagnostic.
Most
error
messages
are
not
written
to
the
standard
output,
since
that
is
often
directed
away
from
the
terminal.
Instead,
error
messages
are
written
to
the
diagnostic
output,
which
usually
appears
on
the
terminal.
Direct
Address
(DA)
addressing
mode
directory
disk
displacement
DMA
In
this
mode,
the
operand
address
is
contained
within
the
instruction.
A
structure
that
contains
files
is
called
a
directory.
The
directory
in
which
the
user
first
logs
in
is
the
~
directory.
A
flat
circular
plate
with
a
magnetic
surface
on
which
data
can
be
stored
by
selective
polarization
of
portions
of
the
flat
surface.
A number
contained
in
the
instruction
for
use
in
calculating
the
effective
address
of
an
operand.
The
displacement
is
added
to
the
contents
of
a
register
during
the
calculation.
Direct
Memory
Address
is
a
method
for
transferring
data
to
or
from main memory
at
high
speed
by
avoiding
the
CPU
regis-
ters.
effective
address
The
address
obtained
after
indirect
or
indexing
modification.
In
non-segmented
mode,
the
effective
address
is
a
16-bit
number.
In
segmented
mode,
the
effec-
tive
address
consists
of
a
7-bit
segment
number
and
16-bit
offset.
In
systems
with
memory
management,
the
effective
address
is
the
logical
address
which
must
be
translated
to
obtain
the
physi-
cal
memory
address.
.
Zilog
42
\.

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ZiLOG System 8000 Specifications

General IconGeneral
BrandZiLOG
ModelSystem 8000
CategoryDesktop
LanguageEnglish

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