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JiffyDOS was not a cartridge or an external accelerator. It was a replacement for both the Commodore 64 and its disk drive. Developed by Maurice Randall of CMD (Creative Micro Designs) in the late 1980s, JiffyDOS rewrote the low-level communication routines that governed how the computer and drive talked to each other. The original Commodore DOS used a slow, handshaking protocol that sent one byte at a time with significant overhead. JiffyDOS replaced this with a faster, streamlined protocol that could transfer data up to five times faster without changing any hardware.

You must also set the drive's ROM (e.g., 1541-II) to the corresponding JiffyDOS drive binary for the speed boost to work. jiffydosc64bin hot