If the sim is running slower than 60Hz, it was using the frame limiter
to not apply because no frame was drawn, and so it would end up running
at full speed. Minifb can save the last frame without cloning it, and
redraw the same frame if no new frame is ready, which allows the limiter
to still delay the next frame, so slower speeds work. This was also
preventing things that didn't update the screen from allowing inputs
including escape to have any effect
AddressRepeater now takes the range it should repeat over, which only
really affects its reported size.
AddressAdapter is now AddressRightShifter, which is literally the operation
it performs, where the input is still the bits to shift the address right by
It turns out to not be too much of a performance issue to allocate
a new frame each time one is produced, so to reduce lock contention
I added a queue where frames are added to and taken from without
locking the frame for the whole update. I'm hoping this will give
more flexibility to frontend implementations, which can simply
skip or repeat frames if needed.
I wanted to make this a bit more modular, so it's easier in theory to
write external crates that can reuse bits, and selectively compile in
bits, such as adding new systems or new cpu implementations
