Re: the dumping discussion on YT, if we're talking common eprom chips (looks like most or all are) that the programmer supports directly then reading them out 3 times each with consistent crcs is good enough to assume they are good. If any are an unlabeled mask rom then it's not as simple but someone could probably look at the dump before he sells it.
If the programmer is a Willem though then just take a hammer to it.
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