Old scanners were SCSI, which made me wonder if you could use them as boot devices, if you could stuff the scanner driver and OCR software into the BIOS. Might be easier now that we have uEFI.
Shame I used to have an SCSI scanner but I already disassembled it for parts.
One can write a simple bootloader, which reads bytes printed on a paper sheet to memory then boots it. Something like: black (0), white (1) or long rectangle (1), short rectangle (0). Wonder about the storage capacity of the A4 paper.
