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- Create Date June 8, 2026
- Last Updated June 8, 2026
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JiffyDOS is a Disk Operating System (DOS) enhancement which gives your C-64 or C-128 the disk access speed it has always needed. A chip-for-chip replacement for the Kernal ROM in your computer and the DOS ROM in your disk drive(s), JiffyDOS achieves levels of performance and compatibility unmatched by other disk speed-enhancement products. Outstanding speed, solid compatibility with virtually all hardware and software, and a new set of desperately-needed commands and features, gives your system a new lease on life and the power to compete with today’s newer, more-expensive machines.
JiffyDOS should not be confused with Cartridges, Turbo ROMs, Burst ROMs or “Parallel” systems. Ultra-high-speed multi-line serial technology enables JiffyDOS to outperform these products without any of their inherent disadvantages. JiffyDOS leaves all ports on your computer open, works with virtually all software, speeds up PRG, SEQ, REL and USR files, and does not require any extra cabling. Owning JiffyDOS also gives you access to some of the best product support available.
JiffyDOS support is included natively in uIEC and all other sd2iec-based solid state drive solutions for the Commodore. Thus, by installing JiffyDOS in your C64 or C128, you can immediately enjoy all JiffyDOS functionality when using these devices.
| * Software and/or documentation made available for download is intended for historical archival purposes. We review each download to the best of our ability to match it to one of the following categories; Abandonware, Freeware, Public Domain, Shareware or Open Source. If you feel there is a download that does not meet one of these stated classifications and hold the rights to it, please contact us to correct said item. |
