These are A-Form, recommended Major Opcode 63 for full-width
and 59 for half-width (ending in s). Major Opcode 63 has room
for 9 A-Form 5-bit XO instructions, 00001, 01001, 01010, 01011,
-01101, 10000, 10001, 10011, 11011
+01101, 10000, 10001, 10011, 11011.
+Major Opcode 59 has 00000, 00001, 00100, 00101, 00110, 00111,
+10000, 10001, 10011, 10111, 11011.
+
| opcode | Description | pseudocode | Extension |
| ------ | ---------------- | ---------------- | ----------- |