[Techtoolslist] Can anyone identify this chip?

[Rodger Boots]

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 at 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 at flippers.com

> [mailto:techtoolslist-bounces at 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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