I have been using my Apple //c for over a year now without problems. Now it won’t boot from built in floppy or floppy EMU. When I try I get this screen. I don’t know what the error code means. Any advice would be greatly appreciated. 
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Apple //c boot error
- Thread starter logan48maer
- Start date
When you boot from a disk, it loads the first sector of the disk to address $800 and then executes whatever code is there. Your computer crashed at address $803 - the number on the left in the monitor output you see, just a couple of bytes into that code. So probably either the sector wasn't loaded correctly, or the disk is bad. Could also be RAM as @bibilit suggests... If I recall, the IIc tests the checksum on sector 0 during boot, so it should be theoretically impossible to load it incorrectly.
