To test this, install AHI (probably preferably 4.18) and copy pi-ahi.audio to DEVS:AHI and PI-AHI to DEVS:AudioModes.
The IRQ trigger magically doesn't work, so this all runs of vertical blank... meaning that it stops working pretty much the instant you try to use it in an RTG mode.
Not very useful at the moment, but I need to take a break from working on this to do a bunch of work.
The separate writes functionality of Musashi was severely getting in the way of any kind of caching of bus longwords, and I found that the negatvie performance impact of disabling separate writes could be negated by creatively applying the address translation cache to the FC reads/writes instead.
This commit requires a `make clean` before rebuilding the emulator with `make`.
