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The table below lists all documented opcodes in extension set A3 for IBM mainframe processors. Each opcode links to a text section with some additional info on the pertinent opcode.
Remark:
Please note that the creation of descriptions for all individual
instructions
is an ongoing process. As yet no such descriptions have been created
for
the opcodes on this page.
All instructions in this table are four bytes in length. The first
byte
always has a value of X'A3', the second half of the second byte
designates the exact instruction.
Information on millicode-only instructions is very limited. What you
find here has been gleaned from various IBM patents. Some of these
patents appear to contain some errors, or maybe even intentional
obfuscation. For example, the instruction LTA is said to have opcode
X'A25' but it is the only known instruction in the range X'A20'
through X'A2F'. In the range X'A30' through X'A3F' however, many
millicode-only instructions can be found. The fact that opcode X'A35'
seems to be unassigned suggests that X'A25' for LTA may well have
been a typo, and maybe should have been X'A35'.
| A3 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | A | B | C | D | E | F |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| WSR | RSR | AMCLHI ASR RCR |
WSRS | TPSW |
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