> It's where people with the skills/technology take the chips and burn off the cover > with acid, then photograph the chip at high resolution so people can work out how the > chip functions.
In this case you would then need to decode the bits from the photo of the internal mask rom and work out the row/column organisation.
If instead of mask rom it has an internal eprom/flash then you need to attach probes to the chip and read them out because set or not set bits in eprom/flash cells don't look different to each other.