Re: N3101 RAM for Missile Command

The N3101 is a Signetics number (datasheet here
<http://www1.cedar-rapids.net/00000028/IHS/N3101.pdf>) that directly
crosses to a 74S289 (datasheet here
<http://www1.cedar-rapids.net/00000028/IHS/74s289.pdf>), and for
completeness I'm including the Intel 3101 datasheet here.
<http://www1.cedar-rapids.net/00000028/IHS/3101.pdf>

So far we have chips that are all open collector output and are
obsolete. That being said, I see no reason why you need open collector
outputs, it's probably just what was available when they designed the
game. A 74S189 (Jameco has them here
<http://www.jameco.com/cgi-bin/ncommerce3/ProductDisplay?prmenbr=91&prrfnbr=1817&cgrfnbr=582&ctgys=502;508;582;>)
should work fine.

The 3101 is NOT compatible with the 5101 or 2102 or anything else. It
is a very fast, very small RAM. 64 bits arranged as 16 x 4.

MyPearl wrote:

>Hello group,
>
>I found that the COLOR RAM (at L7) of my missile command has litterary
>cracked open. Weird thing is it, still works, but becomes unstable now and
>then and triggers the Watchdog.
>
>The partnumber on the chip is 'N3101'
>
>I cannot find a datasheet for this part, nor a source, or a cross to a
>replacement on the web...
>
>Does anyone know where I could get this RAM, or equivalent?
>
>Hope someone knows...
>
>Thanks
>
>Mendel Pearl
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>
>
>

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Received on Sat Jan 31 04:54:22 2004