Weekly Classic Computer Trivia Question (20150112)

[Rick Murphy]

At 01:17 PM 1/12/2015, Johnny Billquist wrote:
>And of course, you also have things like OS/8, which runs with 
>interrupts off at all times, to which the answer to the original 
>question would be "OS/8". :-)

The OS/8 FORTRAN runtime (FRTS) runs with interrupts enabled. OS/8 in 
general doesn't care if interrupts are on, which is how OS/78 (or was 
it OS/278?) symbionts worked. So, you can't blame OS/8 for getting into 
the way. There's nothing typically in OS/8 that requires interrupts to 
be disabled, but it's true that most of OS/8 doesn't do anything to 
handle interrrupts.

Interrupt latency? Either you're looking for the length of the "skip 
chain", or interrupt blockers like CIF instructions.
         -Rick