IBM System/370

FIXED STORAGE LOCATIONS
Area, Hex EC
dec, addr only Function
0- 7 0 Initial program loading PSW, restart new PSW
8- 15 8 Initial program loading CCW1, restart old PSW
16- 23 10 Initial program loading CCW2
24- 31 18 External old PSW
32- 39 20 upervisor Call old PSW
40- 47 28 Program old PSW
48- 55 30 Machine-check old PSW
56- 63 38 Input/output "Id PSW
64- 71 40 Channel status word C.ee diagram)
72- 75 48 Channel address word (0-3 key, 4-7 zeros, 8-31 CCWaddress]
80- 83 50 Interval timer
88- 95 58 External new PSW
96-103 60 Supervisor Call new PSW
104-111 68 Program new PSW
112-119 70 Machine-check new PSW
120-127 78 Input/output new PSW
132-133 84 CPU address 8SSQC'd with external intlllTuption, or unchanged
132-133 84 X CPU address assoc'd with external interruption, or zeros
134-135 86 X External interruption code
136-139 88 X SVC interruption (0-12 zeros, 1~141LC, 15:0, 16-31 code]
140-143 8C X Program interrupt. (0-12 zeros, 1~141LC, 15:0,16-31 code]
144-147 90 X Translation exception address (0-7 zeros, 8-31 address]
148-149 94 Monitor class (0-7 zeros, 8-15 class number]
150-151 96 X PER interruption code (0-3 code, 4-15 zeros]
152·155 98 X PER address (0-7 zeros, 8-31 address]
156-159 9C Monitor code (0-7 zeros, 8-31 monitor code]
168-171 A8 annelID (0-3type,4-15model,I6-31 max.IOELlength]
172·175 AC I/O extended logout address (0·7 unused, 8-31 address]
176-179 BO Limited channel logout (see diagram)
lB5-187 B9 X I/O address (0-7 zeros, 8-23 address]
216-223 DB PU timer save area
224-231 EO lock comparator save area
232-239 E8 Machine-check interruption code (see diagram)
248-251 FB Failing processor storage address (0-7 zeros, 8-31 address]
252-255 FC Region code'
256-351 100 Fixed logout area'
352-383 160 Fl08tin!l"point register save area
384-4471180 1 ~neral register SIMI area
448-511 lCO ntrol register save area
512t 200 CPU extended logout area (size varies)
'*May vary among modelSj see system library manuals for specifiC model.
tLocation may be chilnged bY programming (bits 8-28 of CR 15 specify address).
5 Channel
6 Main storage control
7 Main storage
8 CPU
9 Channel
10 Main storage control
11 Main storage
12 13 15 16
12 Control unit
16 I nterface address
17·18 Reserved (00)
19 Sequence code
20 Unit status
21 Cmd. addr. anO key
22 Channel address
23 Device address
23 24 26 2829 31
24-25 Type of termination
00 I nterface disconnect
01 Stop, stack or normal
10 Selective reset
11 System reset
28(A) I/O error alert
29-31 Sequence code
MACHINE-CHECK INTERRUPTION CODE (hex E81
Page 2·14
Val iditv indicators
MCEL length
55
1
56
24 Fail ing stg. address
25 Region code
27 Floating-pt registers
28 General registers
29 Control registers
30 CPU ext'd logout
31 Storage logical
46 CPU timer
47 Clock comparator
31
63