On Tue, 11 Feb 2020 23:53:58 -0500, Randy Hudson <[email protected]> wrote:
>In article <[email protected]>, > <[email protected]> wrote: > >> I've got a copy of "IBM Operating System/360 Assembler Language" copyright >> December 1964. Pretty sure all the opcodes listed in Appendix B (Machine >> Instruction Mnemonic Codes) are still supported by the hardware (I haven't >> checked 'em all). Off the top of my head, the I/O instructions, SIO, HIO, CIO, TIO, and TCH, were removed with the introduction of 370/Extended Architecture around 1982. Read Direct and Write Direct were also removed at about the same time. There may be a few other instructions that have been removed, but IIRC they are all privileged instructions. -- Tom Marchant ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
