Re: Can anyone identify this chip?

OK, here we go. Teeray nailed it. Datasheet attached, just need to strap
pins 26 & 27 to whatever the game uses to access this part and read it as a
2764.

On Tue, Nov 19, 2013 at 7:31 PM, Clay Cowgill <c.cowgill@comcast.net> wrote:

> 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 21:01:40 2013