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C64 Boot Menu

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Pin 1 Mode:

Off Switch 1/2 Button /Rot

SD card unreadable.
The card is inserted, but its filesystem couldn't be parsed. Most common cause: the card is GPT-partitioned instead of MBR (macOS Disk Utility does that by default).

Fix: reformat the card as MS-DOS (FAT32) with Master Boot Record scheme.
macOS CLI: diskutil eraseDisk MS-DOS SDCARD MBR /dev/diskN

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