11 Jul
2014
11 Jul
'14
2:30 a.m.
I've seen 16, 22, and 24 cited as the official number. The VAX architecture
manual seems to suggest 24. If the number is indeed more than 16, how are
they encoded? Seeing as how the manual says 4 bits are used for specifying
the specific mode, and 4 for the register selection, and seems to imply
that the operand specifier is always a byte long.
Sorry for the potentially dumb question.