Interrupting Cow

Hello everyone! This took a lot longer than I expected due to a large amount of me getting confused by how interrupts work. Let’s dive in!

Halt!

After dealing with tick returns, the next step was dealing with interrupts. There are two bytes in memory that concern interrupts. One is IE (0xffff), which tells which interrupts to listen for, and the other is IF (0xff0f), which tells which interrupts are currently pending. Dealing with these was easy enough, but there was another thing that needed addressing:

The Halt Bug

The halt bug is a known bug that, should Halt be ran when there are interrupts pending and the IME (interrupt master enable I think) is off, it doesn’t halt and the next instruction runs twice. I was both confused by how this behaved and how it was triggered, which caused issues with my code that had to be addressed.

I wasn’t able to deal with anything besides interrupt handling, so that’s all for now!