Re:US passes emergency waiver over fuel pipeline cyber-attack
by WalterBright on Sunday May 09, 2021 @10:48PM
(#27102191)
Thanks for your many informative posts here. It's a pleasure reading from someone who knows what they're talking about :-)
I did say ROMs, but you can also use EEPROMs, which are erasable in-circuit, and you certainly put a physical write-enable in that circuit. Ideally, it would be a momentary push-button that has to be pushed in person on-site.
Back in college we used EPROMs, which are erased by putting them for 20 minutes or so under a UV lamp. EEPROMs came out later.
I did say ROMs, but you can also use EEPROMs, which are erasable in-circuit, and you certainly put a physical write-enable in that circuit. Ideally, it would be a momentary push-button that has to be pushed in person on-site.
Back in college we used EPROMs, which are erased by putting them for 20 minutes or so under a UV lamp. EEPROMs came out later.