IBM System/360 20 - 106

r--------r-
I ,
IPositionl Symbolic
Address I Displacement*1
J-----+--
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
1; 6
17
18
19
20
21
22
SYSRES
SYSRDR
5Y5IPT
SYSOPT
5YSL5T
SYSLOG
SYSOOO
SYSOO 1
SY5002
SYS003
5YS004
SY5005
5YS006
5Y5007
5YS008
SY5009
5YS010
SYS011
5YS012
SYS013
SYS014
SYS015
--+ -J
I 00
I 02
I 04
I 06
I 08
1 OA
OC
OE
10
12
14
16
18
1A
1C
1E
20
22
24
26
28
2A
_______ L--- _____________ L
* in hexadecimal notation
Figure 46. Arrangement of Logical unit
Table, and Displacement of Log-
ical Unit Blocks
During the execution of RPG object pro-
grams, a number of halts may occur that are
not associated with any halt codes shown in
the list. These halts occur when an arith-
metic operation is performed on an invalid
packed-decimal operand. The operation code
of the instruction that led to the halt is
then displayed in the U-L fields. (For
more details, see the section Using th~_lR~
R~£Q£!_R£Qgram_2gnerato£.)
In addition to programmed halts, the fol-
lowing non-programmed halts (machine stops)
may occur durin9 the execution of IBM-
supplied or user-written programs:
1. A CPU process check -- indicated bi the
Process indicator on the cpu console.
2. A machine check on the 2520 Read/Punch
or on the 2560 MFCM -- indicated by the
Machine Check light on the affected
unit.
3. A specification error (programming
error stop) -- indicated by a nonzero
I-field on the CPU console.
After a cpu process check or a machine
check on the 2520 or 2560, no restart pro-
cedure can be used. If it is not possible
to resume successful operation after pres-
sing the System Reset key on the cpu and
reloading the interrupted program, the
attention of an IBM custome~ engineer is
normally required. For information about
correcting a specification error refer to
the 5RL publication I~~_~Y§!~~L36g_~QQgl
1L-KYnctional Chara.fte~istic§, Form A26-
5847. A specification error can only be
corrected by the programmer.
When a machine stop occurs on a Submodel
5 and all attempts to resume operation
fail, try to restore the micro program
before calling a customer engineer. (Refer
to ~endix B. Micro Prog£am LQ~g
g£Q.fedu];~.§) •
106 System/360 Model 20 TPS Operating Procedures