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JiffyDOS 128 KERNAL ROM Overlay Image Set

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Product Description

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.


  • 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 C128, including images for both the C64 and C128 KERNALs.

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Product Reviews

  1. Ludicrous speed!! They've gone to plaid!! 5 Star Review

    Posted by on 13th May 2017

    Forget your fast-load cartridges, this is the real deal! Lightning fast and with additional basic commands to make life even easier! Installation was easy - this is a 2-chip kernal replacement for the C64 kernal and the 128 and it's recommended to drill the hole for the switch on the side, but I chose to go on top - I had a minor problem with the soldering, but had gotten a speedy response from Mr. Brain! Highly recommend this product to any Commodore enthusiast with a 128 and I highly recommend this site for any and all your retro computing needs. Best service ever. I'm more than a little late with my review. Sorry about that!

  2. Emulation Booster 5 Star Review

    Posted by on 15th Feb 2016

    Outstanding add-in for us VICE users (C-128 and 1570)! Thanks very much for making the product available to those of us who weren't around for the fun the first time round!

  3. Another Excellent Product! 5 Star Review

    Posted by on 11th Feb 2014

    As always, an excellent product from Retro Innovations! I've bought a few ROM images to get my Commodore gear up and running with JiffyDOS and have never had a problem. The customer service is excellent also, when you do have questions!

    Thanks again!

  4. Zoom zoom 5 Star Review

    Posted by on 21st Jul 2011

    Packaging of the ROMs is top-notch, and I was able to install the switch anywhere in the C128 case I wanted, given the wire length supplied.

    My only complaint is the difficulty in finding the instructions... P.s. they're here:

    But you can't find them with the site search. :-) A link from the description might be nice. Otherwise... thanks!

    (Thanks for the note: We'll add a link)

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