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Maintenance
Operation
Error Logout
Normal Syst.-n / 360
Operation
ROS Mode
l.
2.
l.
2.
3.
l,
' 2.
Maintenance Operation
Normal Systf!m/360 Op .. rotion
Sequence Counter Mode
FLT load
Logout:
a.
Error
b. Logout Pushbutton
Main Store Mode
Main Store Mode FL T's
..,p.,.__~4';;..
Logout
-
L·""'t
Main Store Ripple Test
ROS Mode
ROS Kernels (Maintenance
l. AH System/ 360 Instructions
Routines)·
2. I - Fetch of Diagnm.e Instruction
a. ROS Mode F LT's
b. AH Logouts or
Scan-Ou~
c, Execution of Diagnose
Instruction
Diagnostics
FIGURE 6. BASIC OPERATIONS AND CPU CONTROL MODES
Sequence
Counter
Mode
Entered via:
Obiectives
Control or Instruction Source
f - - - · - - - - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - " - - - - - · - - - - - - - + - - ·
__ " _____ " _ _ _ _ _ _ __,
I
I.
FLT mode sw on "Sturt-Lood"
1 or 2.
Read FLT mode tapes or disks into
Controlled directly by sequence stats and
and Load PB
storage: "OR 's
11
each pair
sequence counter.
2.
Coll for FLT load:
(odd/even) of consecutive words on
a. MS mode -- op code A
tape or disk including parity bit
b. ROS mode -- scan*E, 00
generation, into each storage
and Em;t 1010
location used.
3.
Logout PB
3 or 4.
Logout into storage:
4.
Initiation of error log
a. SOR to location 80
b,
SAR on;J byte stats to location 84
c. I AR to locoti on 88
f-.---------~-r--
Entered._v_;o_._·_
------------~~-~-~--~~-'-~~~~~~~o
__
b_i_e __
c_ti_v_e_s~~~~~~~-~~~~-C_o_n_r_ro_l_o_r~ln_s_tr_u_c_ti_o_n~So_u_r_c_e~~~~~~-i
l.
Call for MS mode while in Seq
lo.
MS hardcore tests end ROS bit tests
1.
FLT op register: Decodes pority bits of
Ctr mode:
or ROS ripple test.
word in SDR.
Main
Store
Mode
ROS
Mode
o. During FLT lood
lb.
Logout into storage:
b.
Logout
(o) ROSDR (groups 1 -4). This is
2,
Main store ripple test:
one ROS word (0-89) which is
Storage test sw off Process,
sent to storage locations
SC,
and Start PB.
90, 94, and 98.
NOTE: The MS ripple test must run
correctly before trying FLT's.
Entered via:
1.
Call for ROS mode while in
MS mode:
a. Performing
Fl
T's
b. Logout
2.
Start PB, then system reset PB.
2.
lo.
lb.
2.
(b) ROAR to location 9C.
Test main storage via ripple
( l 1s, 0 1 s, worst, and reverse worst)
Objectives
ROS hardcore tests and zero and
ane
cycle tests.
Logout into storage:
CPU and/or channel status.
Progressive scan of channels,
Special maintenance routines
(kernels) in ROS.
FIGURE 7. CPU CONTROL MODES FOR MAINTENANCE OPERATIONS
2.
Storage test switch: Setting determines test.
Control or Instruction Source
1.
FLT Op register: Decodes emit field bits
(under microprogram control).
2.
Microprogram control and linkage control
words (LCW's).
Maintenance Features
(3/71)
19
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