Product Overview

Are you the proud owner of a Commodore 64 Ultimate? If so, (or if you just want a deal on a set of ROMs), here's the full set of JiffyDOS ROMs for your C64 Ultimate:

1 x C64 JiffyDOS
1 x 1541 JiffyDOS
1 x 1571 JiffyDOS
1 x 1581 JiffyDOS

If you'd like the smaller set that just includes 64 and 1541 support, look for our "Standard" pack.

And, enjoy your new C64 Ultimate!

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.

Notes:

This purchase provides the buyer a license to utilize the downloaded ROM overlay image on one computing device or emulation environment. Each use must have a separate license for legitimate operation. Please contact RETRO Innovations for bulk purchase information.
The image set contains all ROM images needed to JiffyDOS-equip the C64 Ultimate, including images for the C64 KERNAL as well as the virtual 1541, 1571, and 1581 drives.
Since this is a digital download, we do not offer refunds for this purchase. Please see our Returns and Refunds page for additional clarity.