[Techtoolslist] Can anyone identify this chip?

[Joe Magiera]

That's strange, attachments seem to be getting stripped off.

John, can you check on that?  The picture I originally sent didn't go
through (it was a small 126K file) and the datasheet Rodger attached didn't
go through either (at least it wasn't attached to the message from Rodger I
got).  I thought it was strange that he said he found a datasheet but never
attached it.

Thanks for the feedback you guys!

Joe

-----Original Message-----
From: techtoolslist-bounces at flippers.com
[mailto:techtoolslist-bounces at flippers.com] On Behalf Of Rodger Boots
Sent: Tuesday, November 19, 2013 7:48 PM
To: Technical Tools Mail List
Subject: Re: [Techtoolslist] Can anyone identify this chip?

This VTI is VLSI Technology, Inc and is NOT the company bought by Murata.
The Wiki says:  The company was later acquired by Philips and survives to
this day as part of NXP Semiconductors.

What he apparently has is a mask-programmed ROM with oddball chip selects
like the old Bally pinballs used.

I had attached a datasheet yesterday in this thread that wasn't the correct
part, but DID have the correct logo on top of sheet 1 and the full company
name on the bottom of the sheets.
On Nov 19, 2013 7:32 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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