Whoo hooo!!! My first faked EPROM.

[JAC]

Pretty poor quality fake. Sadly this was out of a tube of mixed EPROMs in the bottom of a box full of chip goodness, so not out of a board - which would have been better. From the remains of the glue residue I assume this was installed and working.

The package is quite distinctive. I dont want to remove all the top marking to reveal what it really is.. maybe someone knows what it really is.

Click to embiggen!

[gg1978]

I've never seen a fake EPROM before, but yeah it's pretty obvious when you look at yours.. Did the paint peel off when the sticker was removed or something?

Maybe you could clean the sticker residue off the window and have a look at the die? Don't see many EPROM's with gold legs either.

[kosmokrator]

im 100% sure ... im have see again this double Collored ep-roms 1-2 times in my collection -scrap stuff i handle all this years.Im not know is double marked under....I think what done is officially remark not faked...
just my poor thought

[JAC]

I didn't peel the sticker back, there was no sticker. These are as they were sold/give/traded with me. I cant remember when/where/how I acquired these. I didn't collect EPROM actively ( I still dont ), so I didn't pay much, if anything at all for these. I think. I don't remember.

Click pictures to embiggen!

Another fake:



I dont think this is fake. The die does not match the fakes above, so I dont think it is this chip. (Nice die !! )



I'll wait a bit longer to see if anyone has more info before I remove the fake remark.

The gold legs are kinda cool, and I don't remember seeing EPROM with gold legs and ceramic package like this. John has so many EPROM I dont want to spend 3.4years clicking through all his EPROM. I am sure he has these.

[jrmunro]

Mine looks the same.

[JAC]

Here is John's ( CPUSHack )

I think this is fake:
http://www.cpushack.com/chippics/EPROM/2708/NationalSemiMM2708Q_3.html

[JAC]

Ok, I removed some more of the top markings..





CPUShack has this same chip:

http://www.cpushack.com/chippics/EPROM/2708/NationalSemiMM2708Q_4.html



Mine has additional marking under bottom.

Fake or not, this is weird.

[Neon_WA]

looks like NS just remarked the eprom to include a OEM custom number

[CPUShack]

just a remarked OEM labeled EPROM
very common in the 70s and early 80s

[JAC]

[Neon_WA]

think the only fake eproms I have seen have been MIL 1702s remarked into Intels
one into a C1702 & the other into a C1702A