[samuellavoie90]

Probably just some 'Write Once' Memory, where they can raise bits to 1 but can't lower them back to 0. (Or the other way around, depending on the memory)

[rusk]

Which is typically implemented as a fuse no? I’m struggling to remember my undergrad EE but I think that’s a thing ...

EPROM back in the day used to work like this. You’d use an ultraviolet light to remake all the fuses when you wanted to wipe and start again.

Flash came along then and made these technologies obsolete.

[monocasa]

Or NOR flash.

[rusk]

yes