V9.3 has the following bugfixes:

 	1. The LM SWITCH command was broken:

 	$ lm switch TEST  LMA1:
 	%CLI-F-SYNTAX, error parsing 'TRUNCATE'
 	-CLI-E-ENTNF, specified entity not found in command tables

 	2. The default buffer size was set incorrectly to 0 for an LM device:

 	Magtape $11$LMA1: (THEINT), device type (Generic SCSI tape), is online, file-
 	oriented device.

 	    Error count                    0    Operations completed                  2
 	    Owner process                 ""    Owner UIC                         [JUR]
 	    Owner process ID        00000000    Dev Prot            S:RWPL,O:RWPL,G:R,W
 	    Reference count                0    Default buffer size                   0  <<<<<
 	    Density                  default    Format                        Normal-11
 	    Allocation class              11

 	  Volume status:  no-unload on dismount, odd parity.

 	The effect was that MOUNT/BLOCKSIZE=x was not honored, and that copy to
 	a files-11 mounted tape may fail for certain files. Other errors are also
 	possible, like DUMP from tape may always give 512 byte blocks.