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MAINTENANCE FEATURES
Two basic types of operation in the Model 50 are
maintenance operations and normal operations.
This section concerns itself with maintenance opera-
tions only. Figure 5 is a listing of various controls,
latches, and triggers used in maintenance operations.
These operations are used to:
1.
Execute special kernels (maintenance rou-
tines) in ROS, entering these kernels via the diag-
nose instruction and using linkage control words
(LCW's) set up by the individual currently using the
kernels.
2. Initiate and run predetermined CPU tests
(FLT's) that locate errors and the components caus-
ing those errors.
3. Initiate and run predetermined channel tests
(Progressive Scan) under control of the diagnose
instruction.
4. Document the status of registers, counters,
and stats, etc. (logout or scan-out).
5. Execute the ROS ripple test program, or run
Backspace T gr
Binary Tgr
Command Cho;n (CC) Tgr
CCWI, CCW2, Read Store, or Write Fetch Request Tgr
Channel Log Controls
Clock Stop Tgri
CPU Control Modes
Cylinder Counter
OTC Tgr
End Update or Start
1/0
Reg Tgr
Error Interrupt T gr
Error Pending Tgr
Error Reg
Fail Tgr
Fi1>t/Second Wold Tgr
FLT
Load
Controls
FLT load Request Tgr
FLT Op Reg
FLT Op Reg Instructions
FLT Program Load T gr
FLT Retry Tgr
GP Stols (0-7)
Hard Stop Tgr
Hardware Address to ROAR
Ignore Error
VO
Tgr
Inhibit IAR Count Tgr
Inhibit IAR Count Control Tgr
Interrupt Roq-t T gr
VO
Mode Stat
IPL Accept Tgr
log Decoder
log Request T gr
Log Tgr
Main Store Mode
ALO Page
KH555
KH211
GCl61
KH511
KE661
KT211
KT151-161
KH553-554
KH531
KH511
KT071
KTOBl
KTOll-031
KH321
KH541
KH511-54l
KTJOl
KHlll
KH121-151
KTI 11
KH555
KSIOl-171
KT161
KH321
KT161
KH511
KH511
KH521
KC531
KH521
KH371
KT101
KT151
KT151
FIGURE 5. CONTROLS, LATCHES, ETC. USED IN MAINTENANCE OPERATIONS
18
(3/71~
Model SO FEMM
a MS ripple test from the storage test panel on the
console.
All other operations will be considered as nor-
mal System/360 operations.
CPU CONTROL MODES
Maintenance operations make use of three different
CPU control modes: sequence counter, main store,
and ROS. Figure 6 describes the two basic types of
Model 50 operation and their possible CPU control
modes. Figure 7 lists the entries, objectives, and
controls for the three CPU control modes used in
maintenance operations.
Sequence Counter Mode
When the sequence counter mode trigger (KT151) is
on, the system is under control of the sequence
counter and the sequence stats. This mode is used
Maintenance CoMole Controls/Indicators/Etc.
Manual Controls
Manual Tgr
Normal Interrupt Tgr
Op to ALCH Tg'
Pan Tgr
Progressive
Scan Control
Progressive
Scan
Stat
Read Store,
CCWl,
((l./+./'2,
or Write Fetch Request
Tgr
Reset/Restart Controls
Retry
Tgr
ROAR Backup Regs (Current ond Previous)
ROS Mode
Scan
IPL Tgr
Sc.an/Log Decoder
Scan T
Mt
Counter
!-OR
tCI
ROAR Logic
Seek Control Tgr
Seel Tgr
Sequence Counter
Sequence Counter Mode
Sequence Stats
Suppress Incorrect Length Indication (SIU) Tgr
Start
VO
to
1/0
T gr
Stop
Request Tgr
Stop Tgr
Storage Holdoff Clock Stop Tgr
Storage Holdaff Controls
Storage Ripple logic
Storage
Test
Controls
Supervisory
Enable
Storage Stat
Supervisory
Stat
Syitem Reset Tgr
Timed Single Cycle Mode
Tgr
Unit Address to ALCH
Tgr
~ip_Page
PKOOl-PS121
Kf781
KS721
KTI 11
KH511
KH321
Kf701
KH321
KH511
KK701
KH555
KK312-313
KTl51
KH521
KH121-151
KH31 I
KKOBI
KH55S
KH555
KH341
KTl51
KH345
GC161
KH511
KTlOl
KS721
KT215
KC51 l-531
KT501-531
PK071
KH331
KH321
KT31 I
KT271
KH511
WrHe Fetch.CCWl, CCW2, or Road Store Roquott Tgr
KH51 l
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