I cleaned the die in hot nitric acid a couple of times but the giant glob didn't come off. When I whinked the chip, enough came off to see the ROM array, but I guess it had protected the passivation layer enough so the metal didn't get dissolved. I'll whink it again when I'm doing other chips and make sure those bits are correct.
I cleaned the die in hot nitric acid a couple of times but the giant glob didn't come off. When I whinked the chip, enough came off to see the ROM array, but I guess it had protected the passivation layer enough so the metal didn't get dissolved. I'll whink it again when I'm doing other chips and make sure those bits are correct.
