A
Apocalypse
Ok so long story short I was in need of a lot of 27C010 and 27C020 EPROMs and as I didn't need the chips quickly (I've been away from home for a month) I ordered them on ebay (27C010) and alieexpress (27C020).
They were 4 times cheaper than local stores (I know, this should have alerted me).
Meantime I've received the chips and I'm back home. First thing that intrigued me is that the chips have a rough surface instead of completely smooth (first time I see that).
For the 27C010, 75% are impossible to burn, 100% for the 27C020.
Of course I've tried everything I could (erase them, different speeds, different programmers, etc.) with no success.
To me the pattern I see is the rough surface, however it's nearly impossible to detect from sellers pictures (generic photos used).
You guys are warned.
P.S.: Anyone else had this problem before?
They were 4 times cheaper than local stores (I know, this should have alerted me).
Meantime I've received the chips and I'm back home. First thing that intrigued me is that the chips have a rough surface instead of completely smooth (first time I see that).
For the 27C010, 75% are impossible to burn, 100% for the 27C020.
Of course I've tried everything I could (erase them, different speeds, different programmers, etc.) with no success.
To me the pattern I see is the rough surface, however it's nearly impossible to detect from sellers pictures (generic photos used).
You guys are warned.
P.S.: Anyone else had this problem before?