General > General Technical Chat
Do you think China can supply authentic 1980's 4164 64Kx1 DRAM chips?
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Alex Eisenhut:
https://www.aliexpress.com/item/32502628342.html?spm=a2g0s.9042311.0.0.26d74c4djJ9h5F

Hard to tell from just their "glamour shot" of a generic vendor-less chip.

I ordered some for fun and what I got doesn't look right to me. I need to dig out my socketed C64 to test these chips later.

On the left is a real TI 41256 from my hoard. It's not the same type but the markings and package details are different from the Ali Express special on the right.

I know the pics are terrible, but the 1980s part has printed or silkscreened markings, but the Ali part is laser etched, I can see the depth of the markings,

Did they laser-etch chips like this in the 1980s?
wraper:
It's an old IC pulled from e-waste with marking removed and relabeled. Likely some 4164 from other manufacturer.
wraper:
It's marked Japan on the bottom and looks similar to Mitsubishi.
Alex Eisenhut:
When I visit my Dad I'll stick a chip on the bench vise and crack the package open and see what pops out.
Tomorokoshi:
Laser-etched? From the '90's? Very suspicious.
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