Re: C64 MMU POC

If it's a cartridge thing I would just use solely IO1 or IO2 space
since it's user's responsibility to choose the compatible hardware
along with compatible software. If that's not the case then a stealthy
approach could be waiting for a correctly timed sequence of writes. I
successfully implemented it in my EasyKernal and IRQHack64 projects. A
short period between two memory accesses to certain address/address
area represents 0, a long period between two memory accesses
represents 1. Hardware is not activated until it gets 24 bit of
information right which is impossible (almost) with the legacy
software. I did this with an AVR part but this can easily be
implemented in vhdl too I guess.