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DIVIDE (DD,DDR,DE,DER) floating-point
instructions
9-8
DIVIDE DECIMAL (DP) instruction
8-5
example
A-26
divide exception
decimal
6-11
fixed-point
6-12
floating-point
6-12
doubleword
3-2
dump, standalone
13-3
e
early exception recognition
6-6
EC (extended-control) mode
4-3
control bit in PSW
4-4, 4-6
ECC (error checking and correction)
11-2
ECPS:VSE mode
1-1
selection of
13-2
ED IT (ED) instruction
8-6
example
A-26
EDIT AND MARK (EDMK) instruction
8-9
example
A-27
editing instructions
8-3
EFCC (existing-frame-capacity count)
3-6
enabling (for interruptions)
6-4
epoch (for time-of-day clock)
4-17
equipment check, bit in I/O-sense data
12-38
error
alert (in limited channel logout)
12-61
channel-equipment
12-13
channel-programming
12-13
checking and correction
11-2
device
12-13
effect of DIAGNOSE instruction
10-4
in PSW format
6-6
intermittent
11-3
state of time-of-day clock
4-17
storage
11-10
storage-key
11-10
event
6-10
PER
4-8
EX (EXECUTE)
(see
EXECUTE instruction)
exceptions
6-10
access
6-15
addressing
6-10
associated with PSW
6-6
data (decimal)
6-11
decimal-divide
6-11
decimal-overflow
6-11
early recognition of
6-6
execute
6-11
exponent-overflow
exponent-underflow
fixed-point-divide
fixed-point-overflow
floating-point-divide
late recognition of
operation
6-12
page-access
6-13
page-state
6-13
6-11
6-12
6-12
6-12
6-12
6-7
page-transition
6-13
privileged-operation
for I/O instructions
protection
6-14
significance
6-14
6-14
12-27
special-operation
6-14
specification
6-14
X-4
IBM 4300 Processors Principles of Operation
EXCLUSIVE OR (X,XC,XI,XR) instructions
7-16
examples
A-13
EXECUTE (EX) instruction
7 -17
effect of address comparison on target instruction
of
13-2
example
A-14
exceptions while fetching target instruction of
6-6
PER event for target instruction
4-11
execute exception
6-11
exigent machine-check condition
11-5
existing-frame-capacity count (EFCC)
3-6
exponent
9-1
(see also
floating point)
overflow
9-1
exception
6-12
underflow
9-1
exception
6-12
mask in PSW
4-5, 4-7
extended control
(see
EC mode)
extended floating-point number
9-3
external
damage
11-9
mask bit for
11-12
interruption
6-7
clock-comparator
4-18, 6-8
CPU-timer
4-19, 6-8
external-signal
6-8
interrupt-key
6-8
interval-timer
4-20, 6-8
mask in PSW
4-4, 4-6
signal
6-8
facility
4-16
externally initiated functions
4-21
f
failing-storage address
11-12
assigned storage location for
3-10
validity bit for
11-11
fetch protection
3-7
bit in storage key
3-4
fetch reference
5-10
access exceptions for
6-15
fetching, of instructions
5-8
FFCC (free-frame-capacity count)
3-6
field
3-2
field separator
8-6
fill byte
8-6
fixed-length field
fixed point
3-2
(see also
binary)
divide exception
overflow exception
mask in PSW
flags
6-12
6-12
4-5, 4-7
field-validity (in limited channel logout)
12-61
in CCW
12-28
floating point
(see also
exponent)
comparison
9-8
conversion
basic example
A-5
instruction-sequence examples
A-31
data format
9-2
divide exception
6-12
instructions
9-1
examples
A-30
numbers
9-1
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