* what about a Z280? Is it just an extension, like the 68k variants?
* separate the debugger out of m68k
* i need a better way of handling disperate reads/writes to I/O spaces, rather than having multiple devices or having a massive chunk of address space allocated, continuously
* add instruction timing to M68k
* YM7101 timing is causing it to be very slow... speeding this up increasing rendering speed a lot, even though the frame shouldn't be drawn that often
* improve the speed of the event loop somehow (replace heap?)
* modify the interrupt handling to make the interrupted device acknowledge the interrupt, probably via the interrupt controller somehow. It might need to be async
such that the cpu tells the int_controller it's acknowledged, and then the interrupting device can check the interrupt controller if it needs to see the ack.
The ym7101 could use the ack as the "off" signal, and perhaps use that for the vsync int bit
* there's potentially an issue with interrupts for m68k where it might not properly mask interrupts causing overlapping interrupts that cause problems (eventually executing RAM in Sonic)
* each device that can make a bus request should have a BusPort which is used to access the bus. Not sure how it'll be created or passed to the device, since
the offset should be set by the builder or system, and the mask and data size should be sent by the CPU (although I suppose some systems could hook it up differently)
* what about even vs odd accesses? If you access a byte, should the bus port possible turn it into a word access, and return only the byte portion?
this would be more accurate for the 68000 which doesn't have an A0 address pin
* there is clearly an issue with the ROM writing 4 bytes to the data port when the autoincrement is only 2. This might be an issue with the fact that the CPU
is making full long word requests even though the 68000 shouldn't be able to (a long word would be 2 word accesses)
