Address Compare Switch - IBM System/370 145 Operating Procedures Manual

• ADDRESS COMPARE SWITCH
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• This switch provides a match when the address used to
access main storage matches the address set in console
switches CDEFGH, and the STORAGE SELECT switch
is set to the MAIN STORAGE position.
• The action taken by the CPU as a result of the match
condition is determined by the ADDRESS COMPARE
CONTROL toggle switch.
Customer Use
AN Y (R eal Address)
This position of the switch is used for normal program
processing. With the switch in this position, a match occurs
for main storage access when the storage address matches
the address set in console switches CDEFGH.
DATA STORE
This position allows a match when the storage address
matches the address set in console switches CDEFGH during
a data store operation.
I/O (INPUT/OUTPUT)
This position of the switch allows a match when the storage
address matches the address set in console switches
CDEFGH, and the operation is storing or fetching data for
an I/O operation.
I-COUNTER (Real or Logical Address)
This position causes a match when the real or logical main
storage uddress matches the address in console switches
CDEFGH, and the operation is an instruction fetch from
main storage.
DATA COMPARE TRAP
This position is used to determine what instruction is caus-
ing a particular storage byte location to be modified. See
the data compare trap procedure.
ANY (Logical Address)
This position of the switch allows a match when the logical,
main storage address used to access storage matches the
address set in console switches CDEFGH.
Service Use
The remaining positions are for service personnel and are
described in maintenance documentation.
Console I ndicators, Switches, and Keys 15