I got this floppy disk drive cheap off a guy who bought it in the early 80’s for his business. As his company went out of business before he started to actually use the drive, it was almost like new when I got it. The only thing that keept it from being in mint condition is the front of the top part which has taken a pounding back in the days.
To decrease the loading times of the few 5.25″ diskettes that I still own, I had to modify this drive with a JiffyDOS kernal ROM which I got from Retro Innovations. When I recieved the ROM it had already a switch attached and was ready to be installed into the 1541 Diskette Drive.
After removing the top, the inside of the drive looked like this….pretty good looking for a 30 year old disk drive.
It is the top left chip that contains the CBM DOS and the one that needs to be swapped with the JiffyDOS Kernal chip. The third image show the JiffyDOS ROM chip inserted instead of the stock IC.
The switch needs to go somewhere and the JiffyDOS manual suggests that it goes somewhere out the back. So I drilled a hole and tightened the screw.
The top cover went back on and it was time to test it.
Booting the Commodore 64 up in JiffyDOS and typing ‘@’ + ENTER will print information of the installed kernal on the disk drive. As evident from the picture below, the switch was turned to the standard CBM DOS kernal. Turning the disk drive off, flipping the switch, turning the machine back on again and retyping the command provided information that the Disk drive now had the speed of JiffyDOS! Now I had to dig out the old floppies and start gaming…
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