At 18:54 -0400 on 08/07/2011, Micheal Butz wrote about Re: Suffix of 64 bit instructions:

Think the B2 opcodes are all two bytes

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On Aug 7, 2011, at 1:01 PM, "Shmuel Metz (Seymour J.)" <[email protected]> wrote:

In <[email protected]>, on 08/07/2011
  at 07:13 AM, Micheal Butz <[email protected]> said:

First time that second byte of the opcode was at the end of the inst


True AFAIK, but S/360 did have opcodes running into bits 16-23.


Are any of them S/360 opcodes or were the introduced with S/370+ architecture? I took a look at them and none jumped out at me to say that they were something that was available on the S/360.

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