On Oct 30, 2012, at 3:15 PM, Richard wrote:
In article <CAArkeuhSPAQaF40hQ-jtzJBs34D2420U47EbZ0j9yjXHij9P8w at
mail.gmail.com>,
Jarratt RMA <robert.jarratt at ntlworld.com> writes:
It has been many years since I wrote any
VAX-Pascal and I find myself
needing to write an AST.
When I see "AST", I think "abstract syntax tree", but that appears
to
have nothing to do with your problem. What do you mean by AST?
Asynchronous System Trap.
It's a DEC-ism (RSX-11, RSTS, VMS) that doesn't have an exact analog in
Unix/Windows land. They're similar to Unix signals in that they act
sort of like "software interrupts". The Wikipedia page is somewhat
informative:
http://en.wikipedia.org/wiki/Asynchronous_System_Trap
- Dave