In emulators like (Versatile Commodore Emulator), you can load a new ROM binary while the emulator is running . This is called a hot swap or hot patch . Instead of restarting VICE, you can attach jiffydosc64.bin to the active C64 instance via the Settings > ROM menu.
Specify the filename for the C64 Kernal to be your jiffydosc64.bin file. jiffydosc64bin hot
Remember, JiffyDOS works best when both the computer and the drive have the ROM installed. If you only have it in the computer, you get speed increases, but not the full range of command enhancements. In emulators like (Versatile Commodore Emulator), you can
Make sure you are using the correct bin file for your specific drive (1541, 1541-II, 1571, 1581). Conclusion Specify the filename for the C64 Kernal to
models often have socketed chips, making the swap a 5-minute task. Long-Term Features and Usage JiffyDOS Follow-Up: You Asked, I Answered! (C64u Q&A)