[sdiy] EPROM curiosity

[Steve Lenham]

I use a fair few EPROMs for firmware upgrades in synths and effects 
units. From time to time (and with my eyes fully open) I have purchased 
"new" EPROMs from Chinese eBay sellers, especially smaller-capacity 
parts (2716, 2732, etc). What I receive are sparkly-new-looking devices 
which - so far at least - program up and work just fine.

However, I wasn't born yesterday and know that the chances of them 
really being new parts from the stated manufacturer are pretty slim. My 
question is this: has anyone got any insight into what these devices 
might really be?

A frequent answer is "failed devices from the factory bin", but I didn't 
think anyone had been making 2716s for some time. Larger-capacity 
devices packaged with a different pinout? If that is the case, they are 
performing a useful service! Recycled used parts? If so, I would like 
the same guys to come and clean my workshop because they are pristine.

Or am I being too cynical? Maybe they are what they claim to be!

Please note: I'm just curious about the technicalities here and don't 
need to be warned off buying from Chinese eBay sellers...we've all read 
the horror stories but a bit of risk can be fun :-)

Anyhow, I don't need Chinese 2716s now that I've discovered the 
Ukrainian clones that were still in production well into the '90s...

Cheers,

Steve L.
Benden Sound Technology