General > General Technical Chat

Identify these weird EPROMs

<< < (6/6)

pcprogrammer:
Good find.

You got to love the naive comment of the first response  :-DD


--- Quote ---I don't think it has 4 windows. It looks like you lost all the chip covers.

That bottom picture shows the microthread connections to the die. That shouldn't be exposed - ever.

--- End quote ---

It is what eproms look like through their window to allow erasure.

Nusa:

--- Quote from: pcprogrammer on February 03, 2023, 05:48:38 am ---Good find.

You got to love the naive comment of the first response  :-DD


--- Quote ---I don't think it has 4 windows. It looks like you lost all the chip covers.

That bottom picture shows the microthread connections to the die. That shouldn't be exposed - ever.

--- End quote ---

It is what eproms look like through their window to allow erasure.

--- End quote ---

Well, the first response wasn't wrong. Unless you've got a special UV light setup, you're gonna have to flip them over and roast the other side to erase them.

As for the windows, correct, that's what EPROM's look like. Light-blocking covers, if applied at all, were typically labels or stickers. Maybe the person was thinking of EEPROM's or mask ROMS? It's not like the younger ones among us have much first-hand experience with the 50 year old technology.

pcprogrammer:

--- Quote from: Nusa on February 03, 2023, 06:28:07 am ---Well, the first response wasn't wrong. Unless you've got a special UV light setup, you're gonna have to flip them over and roast the other side to erase them.

--- End quote ---

I'm only referring to the post of the person with the handle "ArcadeTechGW" and what he/she stated is just wrong.

The way I read it is that he/she thinks that the chips are decapsulated with the die and wire bonds exposed to plain air, as if he/she had never seen chips with windows before.

That you need either an eraser with two UV lamps or mirrors of some kind to do it in one go or flip the chips over to fully erase them is obvious if you know about the technology. And even though it is old technology it has been used well into the nineties.

ieure:
The OP in that KLOV thread (crazygamer) is who I got these from.

I don't know ArcadeTechGW personally, but I'm certain they've seen EPROMs before.  I had someone else say that it looked like there were "holes in them," maybe seeing four of the quartz windows throws people for a loop.

Had some issues with the XP box that runs my programmers, so I haven't had a chance to try dumping these yet.

Alex Eisenhut:
60$?

Navigation

[0] Message Index

[*] Previous page