Parameters

At the point of entry, CA VM:Tape passes the following parameter list to this exit using Register 1:

R1 =>	+0	A(TMC record for volser requested)
	+4	A(Length of TMC record)
	+8	A(Constant ‘READ’ or ‘WRITE’)
	+12	A(Common User Exit Buffer)

Note: The TMC record can be modified by the exit.