SWABI - SWAP BYTES IN A DATA ARRAY
25JAN78-1000  GFM
 
	CALL SWABI(IDATA,NBYTES)
	 IDATA=ARRAY CONTAINING WORDS IN WHICH BYTES ARE TO BE SWAPPED
	 NBYTES=NUMBER OF BYTES TO BE SWAPPED
 
NOTES:	BOTH ARGUMENTS ARE INTEGER*2.
 
	ROUTINE CALLS EXIT IF NUMBER OF ARGUMENTS IS NOT EQUAL TO 2.
 
	THE ROUTINE COMPUTES THE NUMBER OF WORDS TO HANDLE BY DIVIDING
	'NBYTES' BY 2.  THEREFORE, AN EVEN NUMBER SHOULD BE SPECIFIED
	FOR PROPER RESULTS.
 
	THIS ROUTINE CAN BE USED IN CONJUNCTION WITH THE OTHERS IN
	CONVRT.OLB TO EXCHANGE FLOATING POINT DATA BETWEEN THE IBM
	360 AND THE PDP 11.  INTEGER DATA CAN BE CONVERTED BY USING
	THIS ROUTINE ALONE TO SWAP BYTES AS APPROPRIATE.