All about VSYNC & 6809 interrupts | Asm Adventures

[@rijaja]

I think I just jumped into something much harder than I'm used to, since the closest thing I did was programming an STM32 processor in C, but I think your explanations were very good because I was still kind of able to follow what was happening. I hope your videos get more attention

[@melkiorwiseman5234]

Further explanation for anyone who still doesn't understand: The PIA is there in order to allow the CPU to find out exactly which device out of several caused the interrupt, so that the interrupt handler can take the appropriate action. It also allows the CPU to disable interrupts from one device while still permitting interrupts from a different device. Without this functionality, the CPU would be limited to three types of interrupt and therefore only three different devices which can cause interrupts. With the PIA in control of interrupts, the CPU can have as many interrupting devices as the PIAs can handle.

[@CocoTownRetro]

Thanks for the info!

[@nowhereman999]

Excellent description of interrupts and the PIA. Your videos are becoming a great resource for coco programming. Thanks for another great video.

[@CocoTownRetro]

I appreciate the kind words. Thank you!

[@Anangelspath]

I’m grateful for your content thank you

[@FedericoTrentonGame]

Thank you for making these videos ❤️

[@acs8-bitzone651]

"bit 2 is insane. I'll come back to it." Lol!

[@MrWaalkman]

Excellent tutorial, thanks!