Memory chip substitute?

Dwight K. Elvey dwight.elvey at amd.com
Mon Aug 15 14:17:49 CDT 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






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