X'64' trace entry

TRACE ID = X'64'
      word 0 	— byte 1 - X'64' OSAM MM I/O POST
			   byte 2 – MM function code
		         bytes 3-4 - Trace sequence number
      word 1 	— MMRE address
      word 2 	— DECB address 
      word 3	 — MMP address 
      word 4	 — Buffer address
      word 5	 — not used
      word 6&7      — byte 1 – post code                   
   		    — bytes 2-3 – status code  
   		    — bytes 4-5 – sense code
       		— bytes 6-8 – not used