Avago Technologies LSI53C1010 - Manual (Page 249)

I/O Completion 10-13
WAIT DISCONNECT
MOVE MEMORY 1, IO_DONE_BUF, DONE_YET_BUF
JUMP scheduler
– Execute a SCRIPTS INT instruction.
This is the simplest method. It causes the SCSI SCRIPTS to stop
processing.
INT io_complete
– Execute a Memory-to-Memory Move to a predetermined
location, then execute an INTFLY instruction to indicate to the
processor to look at the predetermined location to verify which
I/O has completed.