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This switch position is also useful in
displaying sequential storage lccations
when used with the mode switch
in
either
the MS DATA or AS DATA positicn.
with the
rrcde switch in one of these positions,
byte-0 and byte 1 indicators
dis~lay
the
addressed location each time the start key
is pressed.
1.1§.7.4 Single Address
~s
This position permits the CE to scan a
single storage address set in switches A,
E,
c, and
D ty
pressing the control address
set key and then the start key.
1.18.7.5 Single Address AS
This position permits the CE to repeatedly
access a single auxiliary-storage locaticn
set
in
switches A, B, c, and D by pressing
the contrcl address set key and then the
start key.
1.18,. 7. 6 Test Fa ttern
This switch position is used to exercise
core storage with data set in switches
A,
E,
c, and D.
Switches A and B should
contain the complerrent of switches C and D;
i.e.,
ABCD
=
FFOO, OOFF, OlFE, or FEOl.
The system must be placed in CE rrcde by
the CE key for the test pattern positicn of
the diagnostic control switch to be
effective.
Each storage aaaress is accessed fcur
tirres bef ere a
+
2 address update occurs.
During these four accesses a readcut,
store, readout, and store sequence is
performed as follows CABCD
=
FFOO).
~
cycle
CJ;;:eration
Data
ocoo
1
Readout
Unknown Clst tirre)
2
Store (AB)
FFFF
3
Readout
FFFF
4
Store (CD)
0000
0002
Same as address 0000.
0004
1
Readout
Unknown (1st tirre)
2
Store (CD)
0000
3
Readout
0000
4
store (AB)
F'FFF
0006
same as address 0004.
This pattern continues for the first 256
bytes of storage and reverses every 256
bytes.
Addr
~
OQeration
Data
0100
1
Readout
Unknown Clst time>
2
Store (CD)
0000
3
Readout
0000
4
Store
(AB)
FFFF
0102
Same as address 0100.
0104
1
Readout
unknown (1st time>
2
store (AB)
FFFF
3
Readout
FFFF
4
Store (CD>
0000
0106
Same as address 0104.
This process continues for each program,
control, and auxiliary storage location.
The resident CSL area of control storage is
read out and regenerated only.
1.18.7.7 Load Program Storage
When the switch is in this position, the
data in switches A,
B,
C, and
D
is loaded
into every halfword of program storage.
When the control storage area of rremory is
reached, the locations are accessed in
sequence, l:ut the store lines are not
activated.
A
storage scan should follow
the load program storage to determine if
the data is stored properly.
1.18.7.8 Load Storage
This function is sill'ilar to the load
program storage operation except that all
core-storage locations (program, control,
and auxiliary, except the resident CSI
area) are loaded with the data set from
switches
A,
B,
c,
and D.
The system must be put
in
CE mode with
the CE key for the load storage position of
the diagnostic control switch to be
effective.
To store into the CSL area, set the mode
switch to
M3
DATA.
The data switches can
then be stored into the CSL area in single
cycle.
1.19 MAINI'ENANCE PROGRAMS
The maintenance prograrr package is designed
to validate systerr and unit operation
rapidly with a minimum of human
intervention.
The package is designed to
progress from l:asic CPU-assurance
microdiagnostics up thrcugh a system
environment macrodiagnostic designed to
exercise and test a majority of the system
in a total system environment.
The package
provides failing-card locating information
of high resolution for rapid repair.
Refer
to 2025 FEMDM, Form Y24-3529, page 1-1.
2025
FEMM
(7/69)
1-125
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