It seems you've got your answer about the IDT7M624 type. It's a ram, per
Raymond Moyers' previous post ("IDT7M624-S65CB RAM STATIC 6553").
Why do you believe there's any association between the part on eBay and this
one? A 64KB SRAM could appear in nearly any application.
Of course so long as one's unable to read the labels (though it looks as
though it's moot, since they appear to be blank) on the other packages in the
multichip module, it's unlikely we'll be able to help you.
When you take these pictures, it's worth keeping in mind that you need
pictures that are expository rather than the "glamour" shots that show off how
pretty the part is. Careful and even lighing of the top, allowing a
reflection-free image of the top, would be more useful.
If the part that's labelled is just a RAM, it's likely that there's some other
designation on the substrate to which the modules that are attached. The
candidate I'd be looking at, however, is that it's a cache ram, since the
other chips look to be similar.
If they were all 64K x8 srams, which would be 32-pin devices, with 7 pins x 9
pins, which these could be (one could tell more easily if they were evenly
lighted and photographed from the top) and there are 16 of 'em, right? That
would easily make for a 1 MB SRAM organized on a 16-bit datapath quite
reasonable. You could have 16 bits of data, 16 bits of address, power, ground
and a few controls. The typical 32-pin 64KB SRAM has 3 chip selects/enables,
and a write enable. I'd bark up that tree if you really need to know what it
is. IDT was pretty well known for cache modules. Have you had an ohm-meter
between the pins on the chips and the module pins?
Dick
----- Original Message -----
From: "Tothwolf" <tothwolf_at_concentric.net>
To: <classiccmp_at_classiccmp.org>
Sent: Friday, May 03, 2002 5:26 AM
Subject: Re: Need IDT 7M624 Info
> On Fri, 3 May 2002 Innfogra_at_aol.com wrote:
>
> > The bottom is the same as the top, 8 more small gold caps. I remember
> > something about them being 1 Meg something or other. That something or
> > other is what I am trying to figure out of course.
> >
> > I wonder if they could be an EEPROM like another smaller chip I have.
> > That one is listed on ebay at the moment as a SEEQ EEPROM. It uses a
> > similar but smaller IDT chip like this as a controller.
>
> From the looks of the printing, the SEEQ printing was added later, likely
> by SEEQ's machines. I'd guess SEEQ had that chip custom made for them by
> IDT (who again made lots of RAM products at one time).
>
> 'Course the chip that really comes to mind for me when I see 'SEEQ' is
> their infamous 8005 used for lots of early 10MB/s ethernet controllers.
>
> > <A
HREF="
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=1728103123">eBay
> > item 1728103123 (Ends May-09-02 12:53:43 PDT ) - Unusual Gold SEEQ 1
> > Meg E</A>
> >
> > Maybe these are a 1 Meg EEPROM based on 64K cores? Anyone got a book
> > out there?
>
> I don't have any IDT books on my shelves, unfortunately. I doubt any of
> the other manufacturers books would help any, either. Have you tried
> contacting IDT (if they still exist)?
>
> -Toth
>
>
Received on Fri May 03 2002 - 08:27:54 BST