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System Service
e.
Press the LOAD switch (this causes the I/O program at location %000000 to begin execution).
f.
If the selectable freeze capability is being used, the CLOCK INHIBIT/FREE RUN switch on the
maintenance panel should be set to the INHIBIT position and the two-position switch on the
control PCA should be set opposite the FRZ position. The selector channel and SCMB can now be
single-cycled through the I/O program.
g. With the CPU in the halt state, the I/O program can be altered (while running) and the panel
indicators can be observed.
h. To stop the I/O program execution, press RESET I/O.
MAINTENANCE PCA DRT
MAINTENANCE PCA
DEV NO. '4
' +
I/O PGM PNTR ('+11
h
MEMORY
~
LOCATION
I
~
I
•
I
DEV NO. '4+1
I
CTRL
I
+2
LEFT BYTE
I
FROM SWITCH
+3
I
READI
%40
MAINTENANCE PCA
+4
. + 1
:~
I
I
I
•
I
I
I
I
''',,000000
~
UJ M P
+5
. . . I
UJMP
I
CNTR/BUFFER
I
l
1 / 0
- - - '
CLR
+6
~
l
",,000000
~~
RESET
+7
~
-
.. L..---""
-
•
",,000000
I
I
",,000002
I
I
"'0000004
I
I
COLD LOAD
1 /
0
PROGRAM
SERVICE
ENGINEER
DESIGNED
10 PROGRAM
,,000006
Figure 4-5. Cold Load Method of I/O Program Initiation
4-46. PCA JUMPERS AND SWITCHES
The following paragraphs and the asoclated illustrations locate and explain the use of the switches and
jumpers located on the system processor PCA's.
The actual switch position and jumpers inserted on a PCA can be determined by referring to the
Configuration Guide of the System Support Log.
4-14
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