[Techtoolslist] Can anyone identify this chip?

[John Robertson]

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 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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