ZiLOG System 8000 User Manual page 52
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
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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