Memory chip substitute? - test-drb@ccmp.vtda.org

15 Aug 2005

...
 From: "Allison" <ajp166 at
bellatlantic.net>

Subject: Re: Memory chip substitute?
   From: "Dwight K. Elvey" <dwight.elvey at amd.com>
   Date: Mon, 15 Aug 2005 10:54:11 -0700 (PDT)
     To: cctalk at classiccmp.org

 From: "Allison" <ajp166 at
bellatlantic.net>

Subject: Memory chip substitute?
   From: "Richard A. Cini" <rcini at optonline.net>
   Date: Mon, 15 Aug 2005 11:12:20 -0400
     To: CCTalk <cctalk at classiccmp.org>

All:

	I'm repairing a few S100 memory boards and I'm having trouble
crossing a memory chip on the SSM MB7 16k board. The chip is an NEC UPD410D.
I have D5101LC1's "in stock". Are these equivalent? 
No, not even close.

UPD410 is a fairly fast semistatic 4kx1.  5101 is cmos 256x4.

What memory board has a upd410 on it?  Very unusual.

Allison

Hi
 It seems like 4044 and 6044 are both 4Kx1 chips. These
were used on HeathKit H8 8K memory boards. I'd suspect that
they might work. The onlt source I've found is a local
place called Anchor Electronics. I don't recall if they
have a web page.
Dwight 
Not even close.  The upd410 is 18pin .6" centers.  Pins are the same as 
TMS4060 and intel 2107 save for the 410 had a static core, the other were
dynamic.

Allison

Ahhh! 0.6 centers. Seems like I've seen these on something
else I have for a KIM expansion card. I do have a NEC data
book someplace with the specs on the UPD410D's. It might
also include a cross reference. Some of the data books did
this.
Dwight