Memory chip substitute?

[Allison]

>
>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