Read Lock Byte; Suspend Control; Release Control; Send Special Interrupt - Honeywell 6000 Series Reference Manual

CONDITIONAL WRITE LOCK BYTE, WRITE LOCK BYTE
These instructions provide a software lock capability in the DSC when the DSC is shared
hetween two EUS.
READ LOCK BYTE
This instruction reads the content of anyone of the 256 lock bytes contained in the DSC
ITlernory.
SUSPEND CONTROL
This instruction is used to seize the DSC by one EUS when the DSC is connected to more
than one EUS via two or more physical channels.
RELEASE CONTROL
This instructior; resets the condition set by the Suspend Control instruction.
SEND SPECIAL INTERRUPT
This instructior. obtains data from the issuing EUS and uses this data for a special
inte rrupt to be sent to all connected EUS, including the is suing EUS.
READ LOGICAL CHANNEL NUMBER
This instruction sends the logical channel number, LA number, and the peripheral
subsystem interface number to the EUS.
~1ajor
Status and Substatus
Table 2-5 lists the possible status returns to the various instruction terminations. The
major statuses and substatuses are described in detail.
CHANNEL READY
The Channel Ready status indicates that the last instruction received has been completed
and no detectable errors occurred.
No Substatus
This status indicates that the controller or device is online and ready, and no detectable
error conditions exist. When received at termination of a seek-type inst:ruction, this sub-
status indicates that the online portion bas been successfully completed. The controller is
free to receive another instruction for that channel.
2-18
DB37