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 program PSW 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 positions 0-3 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 a PSW 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 a PSW 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 of STORE 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 of GA22-7000-4 Revised September 1, 1975
By TNL: GN22-0498
stored only when the CSW or a portion
of the CSW is stored. It may be stored in
either the BC or EC mode.
185-187 I/O Address: During an I/O interruption
in the EC mode, the two-byte I/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 an I/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 Main Storage" 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 locations 0-7. The contents of
these locations are used as the new PSW 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-Status Save Area: Information is
stored at locations 216-231,256-271,
and 352-511 during the execution of the
store-status operation.
Interruptions 91
Page of GA22-7000-4 Revised September 1, 1975
By TNL: GN22-0498
Hex
o
4
8
C 10 14
18
'1C 20 24
28
2C 30 34
38
3C 40 44
48
4C 50 Dec
o
4
8
12
16 20 24
28
32
36 40 44
48
52
56 60 64
68
72
76 80 54 84
58 88
5C 92 60 96
64 1100 68 1104 6C 1108 70 1112 74 1116 78 1120 7C 124 80 1128 84 1132 88 1136 8C 140 90 1144 94 1148 98 152 9C 156 AO 160 A4 164
A8 168
AC 172 BO 176
B4 180 B8 184
Restart New PSW Restart Old PSW External Old PSW Supervisor Call Old PSW Program Old PSW --
Machine-Check Old PSW I nput/Output Old PSW Channel Status Word
Channel Address Word -- Interval Timer
External New PSW Supervisor Call New PSW --
Program New PSW Machine-Check New PSW Input/Output New PSW --
Processor Address External-I nterruption Code oooooooooOOOOllLClo Superv.-Cail-Irptn. Code . -- 000000000000 ollLc\a :Program-I nterruptiori Code
.. -- 00000000 Translation-Exception Address
-- 00000000 Monitor CI.# PER c.IOOOOOOOOOOOO 00000000 PER Address 00000000' Monitor Code
-- Channel 10 10EL Address
Limited Channel Logout 00000000 I/O Address
Assigned Locations in Real Main Storage
92 System/370 Principles of Operation Hex Dec
BC 18 8 CO 19 2
C4 19 6
C8 20 0 CC 20 4 DO 20 8
04 21 2
08 21 6
Machine-Check CPU-Timer Save Area
DC 22 0 EO 22 4
Machine-Check Clock-Comparator Save Area
E4 22 8
E8 23 2
Machine-Check Interruption Code
EC 23 6 FO 24 0 F4 24 4
F8 24 8 000000001 Failing-Storage Address
FC 25 2 100 25 104 26 108 26 10C 268
6 0 4 .... ...., .... ,..... 154 340 158 344
15C 348 160 352
164 356
168 360 16C 364 170 368
174 372
178 376
17C 380 180 384
184 388
188 392
18C 396 ..... t.,... 1B4 436
1B8 440 1BC 444 1CO 448
1C4 452
1C8 456
1CC 460 1F4 1F8
1FC 508 Region Code
Fixed Logout Area
Machine-Check Floating-Point Register Save Area
Machine-Check General-Register Save Area
Machine-Check Control-Register Save Area -t.,... ........... -t.,... J
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