validity flags (in limited channel
logout) 13-82
variable-length field 3-3
vector facility0-5,2-4 effect of power-on reset on 4-35
vector-facilityfailure (machine-check
condition) 11-18
vector-facility source (machine-check
condition) 11-19
vector-operation exception 6-28
vector operations, publication refer-
enced v
version code10-48 virtual address 3-5
virtual storage3-20 volatile storage 3-2
effect of power-on reset on 4-35W WAIT (SVC), example of routine to bypass
A-42
wait indicator 12-6
wait-state bit
inBC-mode PSW 4-8
inEC-mode PSW 4-6
warning (machine-check condition) 11-18
subclass-mask bit for 11-28
word 3-3
word-concurrent storage references 5-31
wraparound
of instruction addresses 5-5
ofPER addresses 4-18
of register numbers
forLOAD MULTIPLE instruction
7-22
forSTORE MULTIPLE instruction
7-36
of storage addresses 3-2
forMOVE INVERSE instruction 7-24
forMOVE LONG instruction 7-25
ofTOO clock 4-24
WRD (WRITEDIRECT) instruction 10-54 write (I/O command) 13-49
WRITEDIRECT (WRD) instruction 10-54 x
X(EXCLUSIVE OR) instruction
X field of instruction 5-5XC (EXCLUSIVE OR) instruction
examples A-17
XI(EXCLUSIVE OR) instruction
example A-18
XR(EXCLUSIVE OR) instruction Z ZAP (ZERO AND ADD) instruction
example A-36
zero
7-18
7-18
7-18
7-18
8-12
instruction-length code 6-7
negative (See negative zero)
normal meaning for byte value
true (floating-point number)iv 9-1
8-12ZERO AND ADD (ZAP) instruction
example A-36
zone bits 8-1
moving of 7-28
zoned decimal numbers 8-1
examples A-5
3
31-bit IDAW (indirect-data-address word)
facility 13-46
Index X-23
logout) 13-82
variable-length field 3-3
vector facility
vector-facility
condition) 11-18
vector-facility source (machine-check
condition) 11-19
vector-operation exception 6-28
vector operations, publication refer-
enced v
version code
virtual storage
effect of power-on reset on 4-35
A-42
wait indicator 12-6
wait-state bit
in
in
warning (machine-check condition) 11-18
subclass-mask bit for 11-28
word 3-3
word-concurrent storage references 5-31
wraparound
of instruction addresses 5-5
of
of register numbers
for
7-22
for
7-36
of storage addresses 3-2
for
for
of
WRD (WRITE
WRITE
X
X field of instruction 5-5
examples A-17
XI
example A-18
XR
example A-36
zero
7-18
7-18
7-18
7-18
8-12
instruction-length code 6-7
negative (See negative zero)
normal meaning for byte value
true (floating-point number)
8-12
example A-36
zone bits 8-1
moving of 7-28
zoned decimal numbers 8-1
examples A-5
3
31-bit IDAW (indirect-data-address word)
facility 13-46
Index X-23