Ah! That's a different question. It's always a research project. I know of no exhaustive "this instruction was introduced with this model" document.
You can go through the various Principles of Operation versions and look for change bars. Not a quick task. You can look at the description for each instruction and look at the Program Exceptions paragraph and find something like "Operation (if the general-instructions-extension facility is not installed)." And then go through the various announcements looking for when the relevant facility was announced. Another trick is to look at the supported opcodes for each hardware level specification for HLASM. As I say, not simple. A research project. I once thought about doing a definitive spreadsheet but I gave up on the project before I had made much progress. Charles -----Original Message----- From: IBM Mainframe Assembler List [mailto:ASSEMBLER-LIST@LISTSERV.UGA.EDU] On Behalf Of João Reginato Sent: Thursday, May 9, 2024 8:07 AM To: ASSEMBLER-LIST@LISTSERV.UGA.EDU Subject: RES: Relative branching instructions info Importance: Low I need to know in what hardware it was first implemented
