Program Display Register 1: This register in local storage (LS address X'79')
contains a parameter passed from the program running in the CCU to the program
running in MOSS for eventual display as display register 1, to an operator.
It can be loaded by executing an output X'71' instruction.
Program Display Register 2: This register in local storage (LS address X'7A')
contains a parameter passed from the program running in the CCU to the program
running in MOSS for eventual display as display register 2 to an operator.
It can be loaded with data by executing an output X'72' instruction.
Operator Address/Data Value Register: This register in local storage (LS
address X'71') contains a parameter passed from the program running in MOSS to
the program running in the CCU when an operator wishes to express an address or
data value.
It can be read by executing an input X'71' instruction.
Operator Function Select Value Register (16 Bits): This register in local storage
(LS address X'72') contains a parameter passed from the program running in
MOSS to the program running in the CCU when an operator wishes to express a
selected function value.
It can be read by executing an input X'72' instruction.
Maintenance Temporary Address Register (MTAR): This register in local
storage (LS address X'7E') contains the main storage address used by any opera-
tion initiated by the program running in MOSS and involving main storage.
Maintenance Temporary Data Register (MTDR): This register in local storage
(LS address X'7F') contains information read out of main storage for the operations
described for the maintenance temporary address register(MTAR) (see above).
CCU to and from MOSS
The CCU interconnects with the MOSS via the MOSS input and output controller
(MIOC) logic located in the PUC (part of the CCU).
The MIOC enables the MOSS to:
Read or write any register or storage location in the CCU.
Set or reset all CCU latches and read out their status.
Interrupt the CCU (CCU hardware errors, IPL request, and so on).
Also, the MIOC allows the CCU to interrupt the MOSS.
CCU Diagnostics
The CCU has diagnostic facilities designed to allow the program to perform test
procedures on the controller hardware. The test routines can be either part of the
online control program or a stand-alone control program used for testing purposes
only. If these test routines are part of the online control program, the telecommuni-
cation lines and adapters not being tested are allowed to continue operating.
The following operations are available for program use:
Chapter 2. Central Control Unit (CCU)
2-43
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