Re: Origins Of Interrupts

On Fri, 3 Jan 2025 03:25:32 -0000 (UTC), John Levine wrote:

According to Lawrence D'Oliveiro  <ldo@nz.invalid>:

>
There is an Asianometry video which says that the first computer to
have interrupts was the Univac 1103.
>
Does this sound right? What’s the earliest architecture anybody knows
of that had support for interrupts?

 
This informative web page repeats that claim but then says he thinks the
Univac I had an overflow trap several years earlier:
 
https://people.computing.clemson.edu/~mark/interrupts.html

OK, but an overflow trap is a synchronous notification from the CPU to do
with the current instruction.

To be clear, I was specifically thinking of asynchronous notifications to
do with external conditions (typically I/O).