Re: Can anyone identify this chip?

That could be an 8Kx8 EEPROM. The '2365' part is jogging a memory way in
the back of my brain from decades ago while making a 'flash cart' for an
Atari 2600 development system. ;-)

I think the VTI part is correct-- the logo on the chip looks like:
http://www.xsmicro.com/parts/VTI/2365-1181/

Maybe try reading it like a 28C64?

I'd wager a guess that it was the same place Murata bought, but back when
they started out they were just making crosses for other manufacturers to
get a start before doing their own stuff. (So like Sipex and Macronix that
started off making Maxim RS232 chip copies and commodity EPROMs as a way to
pay for their R&D of their own stuff which would eventually take over the
catalog.)

-Clay

-----Original Message-----
From: techtoolslist-bounces@flippers.com
[mailto:techtoolslist-bounces@flippers.com] On Behalf Of Joseph Magiera
Sent: Tuesday, November 19, 2013 5:26 AM
To: Technical Tools Mail List
Subject: Re: [Techtoolslist] Can anyone identify this chip?

Hmmm... I can see I attached a pic, but it didn't get through.  Sorry about
that.  I have posted the pic here:
 
http://www.tollianweb.com/uc/vti.jpg
 
It's IC 1N from an Exidy 440 PCB (Whodunit in this case).  I'd really like
to identify the manufacturer.  I looked at several IC logo web sites and
nothing comes up.  It's in a bank of 2764's and supposedly supposed to be
able to be read as a 2764, but my EETools Top Max is unable to read it. 
Really a mystery to me why I can't find this symbol at all (and why if it is
equivalant to a 2764 my reader can't read it).  It's not a bad chip as the
game boots up and passes all self tests without any complaining.
 
If anyone might be able to identify what IC is on 6K on the same boardset
type, that would be appreciated too.  On my board, it's a National 74S28(x)
where "x" is either a 7 or an 8, but it's overlayed with an Exidy part
number stamp.  National 74S287 crosses to an MMI 6301 (Signetics 82S129) and
a 74S288 crosses to a MMI 6331 (Signetics 82S123).
 
Trying to dump a Whodunit ROM version that's not in MAME.  Thanks,
 
Joe

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Received on Tue Nov 19 20:32:57 2013