Re: Where to start on Missile Command PCB repair

Hey Guys,

So I replaced the 6502 socket and all the EPROM sockets as well, did a
quick check and the crystal is on the board, though I have no idea if its
good or not.

Anyway went to turn on the game and I don't get a loud hmmm anymore, but
nothing is appearing on screen and the game still appears to be dead.

I need to either figure out how to use my catbox, find a 6502 pod, OR find
my logic probe . . .

-Grant

On Thu, Oct 31, 2013 at 9:02 PM, Matt J. McCullar <mccullar@flash.net>wrote:

> **
> Nice work so far, Grant. Here is where you can find images showing how to
> "strap" _Missile Command_ boards for different EPROMs:
>
> http://www.ionpool.net/arcade/atari/MC2708.jpg
> http://www.ionpool.net/arcade/atari/MC2716.jpg
>
> You can modify each one of the 4164 RAM chips to "behave" like a 4116.
>
> How to use a 4164 chip instead the original 4116:
>
> - Bend pin 1 und 8 upwards so they no longer go into the socket's
> connectors.
> - Connect Pin 8 and 9 with one another through a short piece of wire.
> - Make sure pin 1 and 8 are not in contact with any other components
> nearby.
> - Insert the chip like this into the socket.
>
> (Some gamers who own Williams games like _Defender_ have zillions of these
> RAMs to modify, and it's a lot easier for them to just modify the board
> rather than all the chips. _Missile Command_ doesn't have very many, and
> that's why I like to just upgrade the chips instead.) You do not have to
> change any jumpers on the _Missile Command_ motherboard for this.
>
> I don't have a _Missile Command_ board within arm's reach right now, but
> the crystal is probably labeled "X1" on the motherboard. It looks like a
> small rectangular silver can. (Unless it's missing!)
>
> Hope this helps!
>
> Matt J. McCullar
>
>

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Received on Thu Oct 31 21:57:07 2013