The MCL65+ boards came in last week and the parts just arrived today, so I soldered one of them together and swapped it for the 6502 in my VIC-20… I had some luck as you can see below! 🙂

The next step will be to use some of the Teensy’s RAM to expand the VIC-20’s memory, then try loading one of the VIC-20’s cartridges on-chip as well. I actually don’t have any VIC-20 cartridges, tapes, or disks, so once I can load ROMs into memory it will be fun to be able to run any of them!

The emulated 6502 has the memory interface abstracted from the CPU, so in theory I can accelerate the core by accessing some memory ranges using internal memory rather than going out to the 1Mhz bus interface. In this accelerated mode the 6502 would run at 600Mhz! 🙂