Re: N3101 RAM for Missile Command

Well.. it took a while before I replaced the 3101 RAM for the LS189. Today I decided to give it a try.

It works!

Thanks for the pullups Atari added to the board at the output, so I could indeed just use the LS189, with O/C outputs.

  ----- Original Message -----
  From: Rodger Boots
  To: rasterlist@vectorlist.org ; mypearl@dds.nl
  Sent: Saturday, January 31, 2004 11:54 AM
  Subject: Re: RASTER: N3101 RAM for Missile Command

  The N3101 is a Signetics number (datasheet here) that directly crosses to a 74S289 (datasheet here), and for completeness I'm including the Intel 3101 datasheet here.

  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) 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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Received on Tue Apr 20 09:30:03 2004