[Info-vax] Whither VMS?

[glen herrmannsfeldt]

Bob Koehler <koehler at eisner.nospam.encompasserve.org> wrote:
(I wrote)
 
<> I know the PDP-10 has XCT, and I thought VAX would have one,
<> but I don't see it in the book.
 
<   No, VAX, PDP-11, Alpha, and don't.  The only good use for it that I
<   ever saw on a PDP-10 was to accomplish the same result as a VAX
<   CASE instruction.

For S/360, some instructions have a length field in the second byte.
EX allows for variable lengths by modifying (a copy of) the instruction
before executing it.  

At least some features of the PDP-10 are similar to features on the
IBM 36 bit predecessors to S/360, so XCT doesn't seem so surprising.
I did do some Macro-10 programming, but I don't remember using it.

-- glen