On Thu, Jun 16, 2016 at 12:53:15PM -0400, 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.
Wow so the original C64 actually passed 9V AC on a pair of power supply pins for the clock, while later models had an onboard crystal. I didn't know that. That would make doing a replacement power supply a bit tricky. > After a particularly nasty bug, that's where I learned about the > importance of semaphores in controlling access to shared resources ;) Good lesseon to learn early. -- Len Sorensen --- Talk Mailing List talk@gtalug.org https://gtalug.org/mailman/listinfo/talk
