General > General Technical Chat

Identify these weird EPROMs

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ieure:
I was given a fairly large box of ICs, dating from the 1970s up to the 1990s.  A lot of stuff that seems more or less computer related; Z80s, 6502s, and various support chips; 74HC TTLs in both PDIP and SOIC packages; PALs; 1980s 2114/4116/6116 RAMs; and so forth.

But these four really jumped out at me.  I'm certainly no EE, but I've been inside way more than my share of electronics, and I've never seen anything quite like this.

[attach=1]

Given the '82-'83 date codes, my best guess is that they're very early production 27256 EPROMs made from four 2764s glued together, with the PAL decoding the two extra address lines.

Anyone seen these before, or know the part number?  Think they'd program as MBM27256s in my UniSite?

Alex Eisenhut:
Beautiful. How much you want for one? Erasing one of these must have been fun. Ding! Time to flip it over!

TheSteve:
Can't give any info on them but they are pretty cool. Have you tried to read one?

ieure:

--- Quote from: TheSteve on February 01, 2023, 05:09:50 am ---Can't give any info on them but they are pretty cool. Have you tried to read one?

--- End quote ---

Hmmm, while I don't think I have any use for them, I'm also not sure I want to sell them.  But since I haven't the slightest idea what they'd be worth, it's a moot point.

ieure:

--- Quote from: TheSteve on February 01, 2023, 05:09:50 am ---Can't give any info on them but they are pretty cool. Have you tried to read one?

--- End quote ---

I haven't.  Given condition and that most of the parts in this lot are NOS (some in factory packaging), I expect they're blank.  But I'll give it a whirl tomorrow.

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