144-147 Translation-Exception Address: During a
program interruption due to a segment
translation exception or a page
translation exception, the translation
exception address is stored at locations
145-147, and zeros are stored at location
144. This field can be stored only when
the old programPSW specifies the EC
mode.
148-149 Monitor Class Number: During a pro
gram interruption due to a monitor event,
the monitor class number is stored at lo
cation 149, and zeros are stored at 148.
This field can be stored in either the BC
orEC modes. PER Code: During a program interrup
tion due to a program event, the
program-event-recording (PER) code is
stored in bit positions0-3 of location 150, and zeros are stored in bit positions
4-7 and at location 151. This field can
be stored only when the instruction caus
ing the PER condition was executed un
der the control of aPSW specifying the
EC mode.
152-155 PER Address: During a program interrup
tion due to a program event, the
program-event-recording (PER) address
is stored at locations 153-155, and zeros
are stored at location 152. This field can
be stored only when the instruction caus
ing the PER condition was executed un
der the control of aPSW specifying the
EC mode.
156-159 Monitor Code: During a program inter
ruption due to a monitor event, the moni
tor code is stored at locations 157-159,
and zeros are stored at location 156.
This field can be stored in either the BC
orEC mode.
168-171 Channel ID: The four-byte channel
identification information is stored at lo
cations 168-171 during the execution ofSTORE CHANNEL 10. 172-175 IOEL Address: The I/O-extended
logout address is fetched from locations
172-175 during the I/O-extended-logout
operation.
176-179 Limited Channel Logout: The limited
channel-logout information is stored at
locations 176-179. This field may be
Page ofGA22-7000-4 Revised September 1, 1975
By TNL: GN22-0498
stored only when theCSW or a portion
of theCSW is stored. It may be stored in
either the BC or EC mode.
185-187I/O Address: During an I/O interruption
in the EC mode, the two-byteI/O ad
dress is stored at locations 186-187, and
zeros are stored at location 185.
216-511 Machine-Check Interruption Code, Save
Area, and Logout: Information may be
stored at locations 216-239 and 248-511
during a machine-check interruption, and
information may be stored at locations
256-351 during anI/O interruption. Ad
ditionally, the contents of locations 256-
351 may be changed at any time, subject
to the asynchronous-fixed-logout-control
bit in control register 14.
Absolute Main Storage
The chart "Assigned Locations in Absolute MainStorage" shows the format and extent of the as
signed locations in absolute main storage. The loca
tions are as follows, and the usage applies to both
the BC and EC modes.0-7 IPL PSW: The first eight bytes read
during the IPL initial read operation are
stored at locations0-7. The contents of
these locations are used as the newPSW at the completion of the IPL operation.
These locations may also be used for
temporary storage at the initiation of the
IPL operation.
8-15 IPL CCW1: Bytes 8-15 read during the
IPL initial read operation are stored at
locations 8-15. The contents of these lo
cations are ordinarily used as the second
CCW in an IPL CCW chain after com
pletion of the IPL initial read operation.
16-23 IPL CCW2: Bytes 16-23 read during the
IPL initial read operation are stored at
locations 16-23. The contents of these
locations may be used as the third CCW
of an IPL CCW chain after completion of
the IPL initial read operation.
216-511 Store-StatusSave Area: Information is
stored at locations 216-231,256-271,
and 352-511 during the execution of the
store-status operation.
Interruptions 91
program interruption due to a segment
translation exception or a page
translation exception, the translation
exception address is stored at locations
145-147, and zeros are stored at location
144. This field can be stored only when
the old program
mode.
148-149 Monitor Class Number: During a pro
gram interruption due to a monitor event,
the monitor class number is stored at lo
cation 149, and zeros are stored at 148.
This field can be stored in either the BC
orEC modes.
tion due to a program event, the
program-event-recording (PER) code is
stored in bit positions
4-7 and at location 151. This field can
be stored only when the instruction caus
ing the PER condition was executed un
der the control of a
EC mode.
152-155 PER Address: During a program interrup
tion due to a program event, the
program-event-recording (PER) address
is stored at locations 153-155, and zeros
are stored at location 152. This field can
be stored only when the instruction caus
ing the PER condition was executed un
der the control of a
EC mode.
156-159 Monitor Code: During a program inter
ruption due to a monitor event, the moni
tor code is stored at locations 157-159,
and zeros are stored at location 156.
This field can be stored in either the BC
orEC mode.
168-171 Channel ID: The four-byte channel
identification information is stored at lo
cations 168-171 during the execution of
logout address is fetched from locations
172-175 during the I/O-extended-logout
operation.
176-179 Limited Channel Logout: The limited
channel-logout information is stored at
locations 176-179. This field may be
Page of
By TNL: GN22-0498
stored only when the
of the
either the BC or EC mode.
185-187
in the EC mode, the two-byte
dress is stored at locations 186-187, and
zeros are stored at location 185.
216-511 Machine-Check Interruption Code, Save
Area, and Logout: Information may be
stored at locations 216-239 and 248-511
during a machine-check interruption, and
information may be stored at locations
256-351 during an
ditionally, the contents of locations 256-
351 may be changed at any time, subject
to the asynchronous-fixed-logout-control
bit in control register 14.
Absolute Main Storage
The chart "Assigned Locations in Absolute Main
signed locations in absolute main storage. The loca
tions are as follows, and the usage applies to both
the BC and EC modes.
during the IPL initial read operation are
stored at locations
these locations are used as the new
These locations may also be used for
temporary storage at the initiation of the
IPL operation.
8-15 IPL CCW1: Bytes 8-15 read during the
IPL initial read operation are stored at
locations 8-15. The contents of these lo
cations are ordinarily used as the second
CCW in an IPL CCW chain after com
pletion of the IPL initial read operation.
16-23 IPL CCW2: Bytes 16-23 read during the
IPL initial read operation are stored at
locations 16-23. The contents of these
locations may be used as the third CCW
of an IPL CCW chain after completion of
the IPL initial read operation.
216-511 Store-Status
stored at locations 216-231,256-271,
and 352-511 during the execution of the
store-status operation.
Interruptions 91