[GTALUG] mysterious restarts

[James Knott]

On 06/16/2016 12:53 PM, Peter Hiscocks via talk wrote:
> The Commodore PET and 64 had a 60Hz real-time-interrupt that did a bunch
> of housekeeping. You could patch your own routines into it, which was
> really handy.
>
> After a particularly nasty bug, that's where I learned about the
> importance of semaphores in controlling access to shared resources ;)

You may recall the Commodore CBMs used in the digital logics lab at
Ryerson.  I vaguely recall using that RTC in some labs.