28 May
2014
28 May
'14
1:42 p.m.
On 05/28/2014 12:50 PM, Henk wrote:
Long ago, I worked on SPERRY 1100 systems (1100/63 and
1100/72), and
was one of the very few people allowed to program MASM. Makes sense,
as I was one of the two EXEC experts (I could read the panic dump and
find out why the system crashed). As said, long ago ...
I remember the EX (execute remote) instruction. I wonder what would
happen if you EX to another EX instruction that EX'd the first EX. That
would cause a loop, I guess. But both systems that I worked on, the
system would not hang, just the CPU executing the EX code.
I seem to recall that the S/360 had a special exception code for an EX
instruction being the object of another EX instruction.
--Chuck