Use the CHECK macro to wait for completion of an I/O request.

The format of the CHECK macro is:

label

specifies 1 to 8 characters that provide a symbolic address for the CHECK macro.

RPL=address

specifies the address of the request parameter list that defines the request. You may specify the address in register notation (using a register from 1 through 12, enclosed in parentheses) or specify it with an expression that generates a valid relocatable A-type address constant.