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: Requires the drive-side JiffyDOS ROM to be named exactly Jiffy.bin or d1541.rom and must be exactly 16KB in size. jiffydosc64bin hot

Emulator users want the authentic experience. VICE, the leading C64 emulator, supports external KERNAL ROMs. Dropping a "hot" JiffyDOS bin into the emulator folder instantly turbocharges all .d64 and .g64 disk images without any hardware soldering. Here’s an informative write-up based on the search

For original 1980s hardware, you must physically replace a chip: How to Install a JiffyDOS into a Commodore 64 the leading C64 emulator