Great question, and I have just tested a solution for you. Note: this assumes my firmware is already on the U1MB (release version 3.10 tested here on an 800XL). Enable 1MB RAM and SDX in the U1MB setup menu. Disable the PBI HDD (you can leave high-speed SIO enabled if you like, but it's not needed). Copy the individual files from the attached ZIP archive onto the FAT partition of your SD card Turn off the Atari, and attach SIDE3 with the switch in the upper (loader)
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