Script command format:

	*<operation code> <operand> <operand> ...


OPERATION CODES:

	SINGLE_STEP - Single step script.

	ECHO - Echo the remainder contents of this line to screen.

		OPERAND:	Text to echo

	REM - Remark. Ignore the remainder contents of this line.

		OPERAND:	Anyting on line gets ignored

	ABORT - Abort the script.

	READ - Read SCSI block.

        	OPERAND 1:	SCSI ID	
		OPERAND 2:	SCSI Block Number
		OPERAND 3:	Total number of bytes (i.e. number of
				blocks X number of bytes per block).
		OPERAND 4:	Tag.

	WRITE

	FREE_RUN - Free-Run, opposite of single-step.

	REQ_OUTSTANDING - Outstanding requests.

		OPERAND:	Number of requests to allow outstanding at
				any given time.