The jiffydos-c64.bin file unlocks several "Quality of Life" improvements for the C64:
In emulators like VICE , you can swap the default kernal ROM for this .bin file to enjoy faster loading times. jiffydos-c64.bin
WE TRIED TO TURN THE LIGHTS ON IN THE LAB BUT SOMETHING BECAME QUIET. THE DRIVES ECHOED IN A WAY THAT WAS NOT THE DRIVE. SOMETHING MOVED INSIDE THE METAL. WE THOUGHT IT WAS A BUG IN THE ROM. WE TRIED TO PATCH IT. THE PATCH DIDN’T PATCH THINGS, IT REMEMBERED THEM. The jiffydos-c64