OPCODE subcommand — retrieve operation code

Use the OPCODE subcommand to retrieve the mnemonic operation code associated with an instruction.

Syntax

  OPCODE

-------- Data Selection Parameters ----------------------------

search-argument

-------- Result Distribution Parameters ----------------

             [ CLIST(var-list)     ]
             [ DIALOG(var-list)     ] 
             [ REXX(var-list)        ]
             [ LIST ]
             [ NOLIST                  ]
             [ SCREEN               ]

-------- SETDEF-Defined Parameters -------------------------
Note: You can override the following SETDEF parameters.
See SETDEF subcommand — set defaults.

             [ PRINT | NOPRINT ]
             [ TERMINAL | NOTERMINAL ]
             [ TEST | NOTEST ]

Parameters
search-argument

The first 2-12 hexadecimal digits of the instruction of interest. If less digits are entered than needed to complete an instruction, trailing zero digits are supplied. Excess digits are ignored.

CLIST(var-list)

DIALOG(var-list)

REXX(var-list)
Requests that the information retrieved be made available to a command procedure or ISPF dialog. The syntax for var-list is as follows:
```
  MNEMONIC(variable-name)
```
LIST

NOLIST

SCREEN

Specifies whether the information retrieved is to be displayed and, if it is, whether it is to appear as part of a line mode report or as an ISPF message on the logical screen.

Example: In z/OS® V1R4, IPCS enhances the display of the multi-byte operation codes associated with z/Architecture®. The split-opcode instructions beginning with E3, EB, or ED are displayed as follows:

Command ===> opcode e303                                                                                                                
                                                                    
 00000000   000A0000   000130E1   00000000   00000000   | ...............                                                                         
 00000010   00FC6FC0   00000000   00000000   00000000   | ..?{...........
                                                                          
 00000020.:3F.--All bytes contain X'00'

The response to the command opcode e303 is as follows:

  BLS18350I Split operation code X'E303' occupies bytes 0 and 5            
                                                                           
  Mnemonic for X'E303' is LRAG