Re: Can anyone identify this chip?

Hi Rodger,

Please resend your attachment, I've increased the size allowance to
2000kb (2mb) - hope that isn't a problem for anyone!

John :-#)#

On 11/19/2013 6:01 PM, Rodger Boots wrote:
> 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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