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Where can I obtain missing extended mnemonic opcode definitions/macros?

April 26, 2017extended macros MISSING Mnemonic obtain opcode

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Where can I obtain missing extended mnemonic opcode definitions/macros?

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If you attempt to assemble a program that includes the more recent addressing mode switching instructions or extended mnemonics for branching, you will receive error messages and the object module will be useless. Jan Jaeger has written a set of macros that extend Assembler H (the assembler included with MVS) so that many programs that were written for later versions of MVS (or OS/390 and z/OS) may successfully assemble with Assembler H. You can install these macros in a user macro library using a jobstream from my site: mnemac.