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Step 0: Make sure your game is fully working

Before installing this kit, make sure your Missile Command game is fully functional. The Multigame kit can only work on a fully functional Atari Missile Command board. This is a good time to enter test mode, make sure the RAM test passes, make sure the test mode screen does not indicate any other failures. Then exit out of test mode, make sure game play, switches, and game sounds are all working correctly. You are now ready to start the installation.

Step 1: Locate and remove the game PCB

Turn your game off and locate the main game PCB. Refer to the Missile Command manual for the location of this boardset. For MC upright, the game PCB is usually attached to the right side of the cabinet (as viewed from the back). The board may have a screw attaching the boardset to the side of the cabinet, which will need to be removed so that the boardset can be removed for easy access. When removing the boardset it is recommended that you label the connector faces with something like "parts side" or "solder side" to insure when re-installing the boardset that everything gets re-hooked up correctly.

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PCB location	PCB location

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Missile Command PCB	6502 CPU Location

Step 2: Remove the 6502 CPU chip

Locate and remove the 6502 CPU chip on the boardset. Use the images below to assist in locating it. See 6502 Chip Identification for additional information. The 6502 CPU chip is a 40 pin (large) chip, located in the corner of the board at location C2. See the yellow square in the picture above. Note: there are two 40 pin chips on the boardset, make sure you remove the 6502 CPU and not the pokey chip. The 6502 CPU is farthest away from the main edge connector adjacent to the smaller "catbox" connector. The pokey chip is near the DIPs.

Remove the chip gently by using a flat head screwdriver to pry it out of its socket from each end. Some of the Atari boardsets have open frame sockets which do not protect the PCB traces. Be careful not to scratch any of the PCB traces underneath the socket. Also be careful not to bend any of the pins. If any pins do get inadvertently bent, you will need to straighten them out before the next step.

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MC 6502 CPU location	6502 CPU Removed

Step 3: Insert the 6502 CPU into the Multigame Kit

Insert the just removed 6502 CPU chip into the empty 40 pin socket on the Multigame Kit. Make sure pin-1 is correctly oriented. Pin-1 is marked on the 6502 CPU chip usually by some type of indentation or circle molded into the plastic. The end of the chip with the marking, needs to match up with the socket on the daughter card that also has a marking on the plastic. Pin-1 is also labeled on the kit pcb with a large "1". If the 6502 chip is installed backwards it will cause permanent damage to the 6502 chip.

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Pin-1 Identification	Multigame with 6502 installed

Step 4: Insert the Multigame Kit into the boardset

Insert the CPU daughter card back into the 6502 CPU socket on the boardset where the 6502 CPU chip was originally removed from. Again, make sure pin-1 of the 6502/daughter card is oriented to correctly match pin-1 on the boardset. Pin-1 will be on the inward facing side of the CPU socket. Use the photos as a guide.

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Multigame Installed	Multigame Installed

Step 5: Double check your work

Review the steps and double check that 6502 CPU is properly installed into the daughter card with no bent pins and that it is correctly oriented for pin-1. Check that the daughter card is also installed snug into the 6052 CPU socket at C2 with pin-1 matched up. Check to make sure the daughter card is not inadvertently off by one row such that one pin on each side is off the end of the socket. REPEAT: If any of these devices are incorrectly installed it may cause permanent damage to the boardset or kit.

Step 6: Power up the game and enjoy!

Reinstall your board into the cabinet, hookup the edge connector with the original orientation and then power up your game. If the game does not come up, turn power off immediately, double check your work, and read over the troubleshooting section. This is a good time to enter test mode and to configure the game settings to your personal preference.

Multigame Self test

Multigame Setup

Step 7: Optional - Remove the ROMS - "ROM SAVER"

As a side note, if you want, you can also remove the old code eproms, hence the expression "ROM SAVER". I personally like to remove the eproms so that the board will consume slightly less power and generate a little less heat. This however is optional. The eproms are located at the edge of the board near the 6502 CPU location in row 1. See pictures below. The more common board will have 6 eproms that can be removed. The lesser common (older style) boards there will be 11 eproms. 10 along the edge, and 1 eprom on row 3.

It is suggested that this step is done after verifying the multigame is working. That is because in the troubleshooting section one of the procedures depending on the problem is to un-install the kit and revert it back to plain Missile Command for verification.

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ROM Locations	ROMs Removed