It's the NES 64! Commodore 64 BASIC running in an NES Emulator

I recently tried porting the Commodore 64 KERNAL and BASIC ROMs to the NES.
I haven't tested it on real hardware, but here it is on FCEUX 2.6.2 for MacOS, using Family Keyboard emulation.
I used the MMC5 mapper to provide ExRAM for nametable RAM and 24 kB PRG RAM for BASIC.
UPDATE: I've released the code and a prebuilt ROM on GitHub! Check it out here: github.com/cal...