[Techtoolslist] Can anyone identify this chip?

[Rodger Boots]

The attachment was only 230k.  The person that really needed it has it
(sent it directly to him).
On Nov 21, 2013 12:39 AM, "David Shoemaker" <davids at oz.net> wrote:


> I never ended up getting any of the attachments.  And 2mb is not an issue

> for me :)

>

> -----Original Message-----

> From: techtoolslist-bounces at flippers.com

> [mailto:techtoolslist-bounces at flippers.com] On Behalf Of John Robertson

> Sent: Wednesday, November 20, 2013 7:49 AM

> To: Technical Tools Mail List

> Subject: Re: [Techtoolslist] 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 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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