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On the 1541 Ultimate II+, you don't need a physical chip. You can simply upload the JiffyDOS .bin (renamed to jiffydos.rom ) to your SD card and select it in the menu. 3. Buying Legit Images

Once JiffyDOS is active, you can use these "Hot" shorthand commands directly from the Display disk directory (without clearing memory). Display disk status (check for errors). Load a BASIC program. ↑filename Load and Run a BASIC program. ←filename Load a Machine Language program (equivalent to £filename Load and Run a Machine Language program. CONTROL + D jiffydosc64bin hot

Watch these tutorials to see exactly how to combine ROMs, burn the chips, and install them into your hardware: On the 1541 Ultimate II+, you don't need a physical chip