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ZiLOG System 8000 User Manual

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B.'.1
(J
\
USER
39
Zilog
USER
APPENDIX
A
GLOSSARY
The
most
important
terms
.
and
acronyms
introduced
in
this
manual
are
listed
in
this
Appendix.
address
A
number
that
specifies
one
particular
element
in
a
set
of
similar
elements.
May
be
either
a memory
address
or
an
~/Q
address.
(See
also
segmented
address,
logical
address,
physical
address.)
address
space
A
set
of
addresses.
The Z8000
can
access
eight
separate
address
spaces:
normal-mode
program
memory
space,
system-mode
program
memory
space,
normal-mode
data
memory
space,
system-
mode
data
memory
space,
normal-mode
stack
memory
space,
system-mode
memory
space,
standard
I/O
space,
and
special
I/O
space.
addressing
mode
The way
in
which
the
address
of
an
operand
is
specified.
There
are
eisht
addressing
modes:
Register,
Immediate,
Indirect
Register,
Direct
Address,
Index,
Base
Address,
Relative
Address,
and
Base
Index.
autodecrement
The
contents
of
a
register
are
decre-
mented
and
then
used,
as
specified,
by
the
instruction.
autoincrement
The
contents
of
a
register
are
used,
as
specified,
by
the
instruction
and
then
incremented.
Base
Address
(BA)
addressing
mode
A
based
address
consists
of
a
register
that
contains
the
base
and
a
16-bit
~
placement.
The
displacement
is
added
to
the
base
and
the
resulting
address
indi-
cates
the
effective
address.
In
nonseg-
mented
mode,
the
base
address
is
held
in
a
~
register
and
the
displacement
is
in
the
instruction.
In
segmented
mode,
Zilog
39

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ZiLOG System 8000 Specifications

General IconGeneral
BrandZiLOG
ModelSystem 8000
CategoryDesktop
LanguageEnglish

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