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ZiLOG System 8000 User Manual

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USER
50
Zilog
USER
segmented
address
In
Z800l
CPU's,
a
23-bit
value
consist-
ing
of
a
7-bit
segment
number
and
a
16-
bit
offset.
segmented
mode One
of
the
Running-state
modes
of
the
Z800l
CPU.
In
this
mode,
the
CPU
gen-
erates
addresses
that
can
have
different
segment
numbers.
shell
A
shell
is
a command
language
inter-
preter.
It
is
possible
for
users
to
write
and
run
their
own
shells,
as
shells
are
no
different
from
any
other
program
in
terms
of
system
response.
stack
A
data
structure
used
for
temporary
storage
or
for
procedure
and
interrupt
serVlce
routine
linkages.
A
stack
uses.
the
last-in,
first-out
concept.
As
items
are
added
to,
or
pushed
onto,
the
stack,
the
stack
pointer
decrements;
as
items
are
removed
from,
or
popped
off,
the
stack,
the
stack
pointer
increments.
stack
pointer
A
general-purpose
register
indicating
the
top
(lowest
address)
of
a
stack.
status
A command
normally
returns
a
status
when
it
finishes.
By
convention,
a
status
of
zero
indicates
that
the
command
suc-
ceeded.
Commands
can
return
non-zero
status
to
indicate
that
some
abnormal
event
has
occurred.
status
flags
Status
flags
are
set
according
to
the
outcome
of
.
certain
instructions
to
direct
the
subsequent
flow
of
the
pro-
gram
as
necessary.
There
are
six
status
flags:
Carry,
Zero,
Sign,
Parity/Overflow,
Decimal
Adjust
and
Half
Carry.
The
first
four
are
grouped
together
to
determine
the
condition
code,
the
last
two
are
used
in
programs
manipulating
~
digits.
Zilog
50

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ZiLOG System 8000 Specifications

General IconGeneral
BrandZiLOG
ModelSystem 8000
CategoryDesktop
LanguageEnglish

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