: Cycles through active drive device numbers (e.g., from 8 to 9).
: Designed with compatibility in mind, JiffyDOS works with existing Commodore 64 software and hardware, making it a seamless upgrade for users.
The primary reason to use this ROM is its capability. Standard C64 disk operations are notoriously slow; JiffyDOS increases data transfer speeds by up to 15 times when paired with a JiffyDOS-enabled drive (or emulator). jiffydos-c64.bin
One night a stranger came by—an elderly man who walked with a cane and smelled faintly of engine oil and peppermint. He looked at the cassette, at the C64, and said nothing for a long time. When he finally spoke, it was in a voice that did not ask for permission: “You’re feeding it things.”
: It mapped common tasks to the function keys (F1, F3, etc.), making it feel like a modern operating system. Modern Legacy : Cycles through active drive device numbers (e
The Commodore 64's original operating system (the Kernal) was known for being extremely slow when loading programs from disk drives (like the 1541). This was due to the slow serial bus protocol.
JiffyDOS was designed to solve this "serial bus" bottleneck. Unlike temporary software "fast loaders" that you had to load from a disk every time, JiffyDOS was a permanent hardware fix. Standard C64 disk operations are notoriously slow; JiffyDOS
To achieve the full 15x speed increase, JiffyDOS requires a matching ROM in the disk drive (e.g., JiffyDOS-1541.bin ). If the C64 has JiffyDOS but the drive does not, the system will default to standard (slow) speeds but still retain the convenient shorthand commands.
What are you pairing it with (1541 drive, SD2IEC, Pi1541)?
