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Xerox 560 Reference Manual

Xerox 560
206 pages
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4.
At
the
completion
of
the
left
shift
operation,
the
floating-point
result is loaded
back
into
the
general
register(s}. If the number was
originally
negative,
the
twols complement
of
the
resultant
number is
loaded
into
the
general
register(s}.
5. The
condition
code
settings
following a
floating-point
left
shift
are
as follows:
2 3
4 Result
- - 0 0 "True"
zero
(all
OIS).
- - 0
Negative.
o Positive.
o 0 - - C
digits
shifted
(fraction
unnormalized,
no
characteristic
underflow).
- - - Fraction
normalized
{includes
"true"
zero}.
-
Characteristic
underflow.
A
negative
shift
count
produces
the
following
right
shift
operations
(again assuming
that
negative
numbers
are
twols
complemented before and
after
the
shift
operation):
1.
The
fraction
field
is
shifted
1
hexadecimal
digit
posi-
tion to
the
right
and
the
characteristi
c
field
is
incre-
mented by
1.
Vacated
digit
positions
at
the
left
are
fi
lied
with
hexadecimal
OIS.
2. If the
characteristic
field
overflows (i.
e.,
is
all
OIS
as
the
result
of
being
incremented),
CC2 is
set
to
1.
However,
if
the
characteristic
field
does
not
overflow,
the
shift process (shift
fraction,
and
increment
char-
acteristic)
continues until
the
characteristic
field
overflows or unti I the
fraction
is shifted
right
lei
hexa-
"decimal
digit
positions,
whichever
occurs first. (Both
terminating
conditions
can
occur
simultaneously.)
3.
If
the
resultant
fraction
field
is
all
OIS,
the
entire
floating-point
number is
set
to
all
OIS
("true"
zero),
regardless
of
the sign and
the
characteristic
of
the
original
number.
4.
At
the completion
of
the
right
shift
operation,
the
floating-point
result is loaded
back
into
the
general
register(s}. If
the
number was
originally
negative,
the
twols complement
of
the resu Itant number is
loaded
into
the
general
register(s}.
5.
The
condition
code
settings following a
floating-point
right
shift
are
as follows:
2 3 4 Result
-
0 0
IITrue
ll
zero
(all zeros).
- 0
Negative.
2 3 4 Result
o Positive.
o 0
IC/
digits
shifted (no
characteristic
overflow).
o
-
Characteristi
c
overflow.
Floating Shift,
Single
Register
The
short-format
floating-point
number in
register
R is
shifted
according
to
the
rules
established
above
for
floating-
point
shift
operations.
Affected:
(R),
CC
Floating Shift, Double Register
The
long-format
floating-point
number in registers
Rand
Rul
is shifted
according
to
the
rules
established
above
for
floating-point
shift
operations.
(If
the
R
field
of
the
in-
struction
word is
an
odd
value,
a
long-format
floating-
point
number is
generated
by
duplicating
the
contents
of
register
R,
and
the
32
high-order
bits
of
the
result
are
1
__
..1_..1
!_
..
____
!_
..
__
D \
Iv\.,n."IIi;;U
I"IV
1'II;;~I~11I;;1
n
.•
I
Affected:
(R),
(Ru
1),
CC
CONVERSION
INSTRUCTIONS
The conversion instructions
are:
Instruction
Name
Mnemonic
Convert
by
Addition
CVA
Convert
by
Subtraction
CVS
These two conversion instructions
can
be used to
accom-
plish
bidirectional
translation
between
binary
code
and
any
other
weighted
binary
code,
such as
BCD.
The
effective
addresses
of
the instructions CONVERT
BY
ADDITION and CONVERT
BY
SUBTRACTION
each
point
to
the
starting
location
of
a conversion
table
of
32
words,
containing
weighted
values
for
each
bit
position
of
regis-
ter
Rul. The
32
words
of
the
conversion
table
are
con-
sidered to be
32-bit
positive
quantities,
and
are
referred
Conversion Instructions
73

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Xerox 560 Specifications

General IconGeneral
Print Resolution2400 x 2400 dpi
Monthly Duty CycleUp to 300, 000 pages
Duplex PrintingStandard
Operating System CompatibilityWindows, Mac OS, Linux
ConnectivityEthernet, USB
Paper SizeUp to 13 x 19.2 inches
TypeMultifunction Printer

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