JiffyDOS KERNAL clone for the Vic 20.
This project was developed from June 6th 2011 to September 21st 2012. The only remaining bug I'm aware of is that the key-combination of CTRL+S does not pause a BASIC or directory listing.
Holding the Commodore key upon boot will prevent autostart cartridges from starting. Holding the CTRL key upon boot will force initialization of BASIC pointers and VIC registers to the values of an unexpanded machine.