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ZiLOG System 8000 User Manual

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USER
49
Zilog
USER
Register
(R)
addressing
mode
register
pair
register
quad
In
this
mode,
the
operand
is
in
a
general-purpose
register.
One
of
eight
pairs
of
general-purpose
word
registers,
designated
RRn
(n =
0,
2,4,
•••
,12,14).
One
of
four
groups
of
four
word
regis-
ters,
designated
RQn
(r.
=
0,
4,
8,
12).
Relative
Address
(RA)
addressing
mode
reset
RETURN
In
this
mode,
the
operand
address
is
calculated
by
adding
a
displacement
found
in
the
instruction
to
the
current
PC
value.
An
internal
CPU
operation
that
initial-
izes
the
Program
Status
registers.
It
is
activated
by
the
RESET
line.
The
RETURN
key·on
the
terminal
is
used
to
execute
commands
as
they
are
entered.
RUBOUT
The
RUBOUT
key
generates
an
interrupt
signal
that
is
used
to
stop
programs
or
to
cause
them
to
return
and
prompt
for
more
input.
Running
state
One
of
the
three
CPU
states.
In
this
state,
the
CPU
is
fetching
and
executing
instructions
or
handling
interrupts.
segment
In
a
Z8001,
a
set
of
adjacent
memory
addresses
(up
to
64K)
with
the
same
~
~
number
on
lines
SNO-SN6.
segment
number
A
number
specifying
a memory
segment.
Placed
on
the
SNO-SN6
lines
during
memory
transactions
in
the
Z8001
system.
Part
of
a
segmented
address.
Zilog
49

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ZiLOG System 8000 Specifications

General IconGeneral
BrandZiLOG
ModelSystem 8000
CategoryDesktop
LanguageEnglish

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