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Alter the Working PSW
1.
Manual mode.
2. Set address 170 in the address switches.
3.
Set the storage select switch to "Local."
4. Set the desired data switches.
5.
Press the store switch.
Miscellaneous Operations
Set the Instruction Counter
1. Manual Mode.
2. Set the desired instruction address in the ad-
dress switches.
3.
Press the set IC switch.
Stop on an Instruction Address
The following steps should not be taken while ex-
ecuting a program but may be taken in any other
mode.
1. Set the desired address in the address key-
lever switches.
2. Place the IAR address compare switch in the
stop position.
3, The address in the address switches will be
executed and the next address in the program will
be displayed in the IAR.
If
the instruction at the ad-
dress in the address switches is a branch instruction and
the branch is taken, the address displayed in the IAR
is the address of the branch instruction.
Changing the address keys while in IAR stop or sync
mode and a program is running, may cause a machine
check condition to occur,
Reset An Error Indication
The check reset switch is normally used to reset all
machine check indicators. Check reset only resets
the error indicators and does not guarantee that the
object program has not been altered by a machine
failure. A system reset, however, resets the com-
plete system, including all pending interruptions.
Bump Storage Display
To display bump storage:
1. Set the storage select switch to MPX 22-31.
2. Set the desired word in address switches 22
and 23.
3.
If
an unshared subchannel is being displayed,
set the unit address in address switches 24-31.
156
(3/71)
Model 50 FF.MM
4. If a shared subchannel is being displayed, set
the modified unit address in address switches 24-31.
5. Press the display switch.
To display bump storage after a hard stop:
1.
Set the ROS address switches (data switches)
to 191 (Hex).
2. Set ROS REPEAT INSN down.
3.
Press ST ART.
4.
Set check control switch to DISABLE.
5.
Set manual channel control to MPX.
6.
Restore ROS REPEAT INSN.
7.
Set the rate switch to INSN STEP.
8.
Press START.
9.
Press STOP.
10. Follow the foregoing procedure to display
desired location.
Clear Storage
1.
System reset.
2. Set IAR keys to zero.
3.
Set rate switch to SINGLE CYCLE.
4.
Set data switch 22 down
(all
others straight
out).
5. Set ROS REPEAT INSN down.
6. Press START.
7. Restore ROS REPEAT INSN.
8. Restore data switch 22.
9. Set rate switch to PROCESS.
10. P.ress START.
11. System reset.
12. Press STORE.
Alternate Method of Clearing Storage
1.
Set data switch 22 down (all others up).
2. Set ROS REPEAT INSN down.
3. System reset.
4. Restore ROS REPEAT INSN.
5. Restore data switch 22.
6. Allow IAR to ripple through one time.
7. Set ROS REPEAT INSN down to terminate.
8. System reset.
ROS Function Check
Figure 1 72 shows the content of the closed loop
starting at ROS 202 that can be used to display,
change, and observe the content of the various CPU
registers (QWlll).
ROS 202 Loop Procedure:
1.
System reset.
2. Set check control switch to DISABLE.
3. Set rate switch to SINGLE CYCLE.
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