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JiffyDOS KERNAL ROM Overlay IC
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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.
Instructions Manuals are provided online only and are available here: http://www.jbrain.com/pub/cbm/manuals/JiffyDOS/. Please download the appropriate set when ordering.
This product is the actual ROM IC that replaces the DOS or KERNAL ROM IC in your CBM unit. The unit comes preprogrammed with the correct version of JiffyDOS.
If you are just looking for the ROM image files, they are available here.
2019-02-07 NOTE: We have exhausted our supply of 24 pin JiffyDOS (64, SX, 1541, VIC-20) and it will be 2 months before new stock will arrive. For immediate orders, check out www.go4retro.com/products/JiffyDOS for other suppliers.
Product Reviews
Showing reviews 1-10 of 41 | Next
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JiffyDOS the Easy Way!
Posted by Carl E. Meece III on 26th Sep 2018
Installation in the 1541-II diskette drive is easy. You have to unscrew and remove the drive mechanism first as the circuit board is beneath it, then just swap the ROM chips. The ROM chip is socketed so replacement is a snap. Drilling the hole for the switch is simple, just be careful and use the location recommended in the instructions. As my C64 doesn't have a socketed ROM chip, I use an EasyFlash III cartridge to get JiffyDOS on my C64 without the need for soldering. Everything works like a charm!
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Works great on the 128D (NTSC Metal case)
Posted by Tim Noyce on 13th Sep 2018
The install went without any issues. Kernel ROM is socketed for both the 128 and the internal 1571, so other than having to open the case and move the internal drive for a few seconds, it went quickly.
No issues post install, and definitely speeds up floppy disk access for programs that don't have their own speed loading routine.
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JiffyDOS is the best!
Posted by Andrew Wiskow on 6th Jul 2018
Adding JiffyDOS to your C64/128 and drives is the best thing you can do to speed up your system. Get it -- you won't regret it!
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Works great
Posted by Tom Wilson on 2nd Jun 2018
I bought the 128 version of JiffyDOS and am 100% pleased with it. The chips took a little bit of work to install (the pins are a bit wide for the socket, so require a little adjustment on a flat surface), but that's to be expected on new IC's.
After installing the ROMs, I now get much faster load times with my SD2IEC on both 128 and 64 mode.
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best addiction to the vic20
Posted by Gen on 9th Apr 2018
This is the best thing better than sliced bread. Brain has a great product. It’s what Commodore should have had right out of the box. But at least you can have it now. So if your tired of typing in load”*”,8 all the time. Now you just hit C=+ run/stop. Perfect
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A Night and Day Difference
Posted by Vinnie D. on 17th Mar 2018
The difference in loading speed is phenomenal, and the new enhanced JiffyDOS commands make using the system so much more fluid. I'm also noticing an improvement in compatibility when using my SD2IEC.
My only complaint would be that the pins are slightly differently shaped from the existing system ROM chip that it replaces. This makes getting the pins into the slot a bit difficult. I had to apply an amount of force that I really wasn't comfortable with putting on my system board to get it to slot in.
There exist stand alone JiffyDOS versions as well, but I like having the switch. Since JiffyDOS isn't compatible with the datasette, I like having the option to quickly turn it off in order to use tapes.
JiffyDOS all in all is a great way to further enhance your C64, and help this over 3 decade old wonder computer continue to do amazing things.
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Excellent upgrade for any Commodore 64c user.
Posted by C64c on 9th Jan 2018
JiffyDOS is a great and must have enhancement for my C64c.
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JiffyDOS is the BOSS
Posted by Michael Bentley on 6th Oct 2017
One of the speediest and most compatible fast loaders around. Takes a bit more effort to install than a cartridge but well worth the time.
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Commodore Plus 4 JiffyDOS.....A Modern Wonder
Posted by Tom Gosser on 2nd Sep 2017
Works just like all the other computer applications of jiffyDOS. The function keys on the Plus 4 are different so there is a difference in how jiffyDOS handles them to some extent. Nice to have disk drive enhancement for the Plus 4 computer! Installation is very easy and quick! JiffyDOS makes drive management so much more efficient!
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Long Time JiffyDOS User
Posted by Jay Hamill on 25th Aug 2017
I've been using JiffyDOS since the late 80's when it was fairly new. It is an absolute MUST for all Commodore 64, 128, and now Plus/4, 16, and Vic-20 computers, and associated drives. Excellent compatibility, quick DOS commands, and convenient file copier are some of the features you'll really miss if you go back to standard CBM DOS. Worth every penny.
Showing reviews 1-10 of 41 | Next
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