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Step 0: Turn off power to the game

It may possible to install this kit without removing your board from its cabinet, however, you may find it easier to install the kit if you do remove the board. In that case, pay careful attention (or label), any wire connections as you disconnect your board so that you can correctly re-hookup the game PCB afterwards. Take note of which side of the 44-pin connector is facing the parts side of the board and which side faces the solder side, This connector is typically not keyed and can be inadvertently plugged in backwards - ouch! It is recommended that you label the connector faces with something like "parts side" or "solder side".

Step 1: Locate the CPU board

Locate the CPU board for your Xevious Board.

CPU Board Click images for a larger view

Atari CPU

Step 2: Remove the chips

Locate and remove the main Z-80 at board location 1N and the ROM at 1M. Use the picture above to assist in locating them. See Z80 Chip Identification for additional information. The Z80 chip is a 40 pin (large) chip.

Remove the chips gently by using a flat head screwdriver to pry it out of its socket from each end. 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. Needle nose pliers work the best for this.

Step 3: Insert the Z-80 into the daughter card

Insert the just removed main Z-80 chip into the empty 40 pin socket on the High Score Save kit. Make sure pin-1 is correctly oriented. Pin-1 is marked on the Z-80 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. There should also may be a small sticker on the daughter card marking pin-1.

Pin-1 Identification Click images for a larger view
Z80 CPU Chip	Xevious High Score Kit	Pin-1 Identification

Step 4: Insert the daughter card into the CPU board

Insert the daughter card back into the Z-80 socket on the CPU board where the Z-80 chip was originally removed from. Again, make sure pin-1 of the Z-80/daughter card is oriented to correctly match pin-1 on the CPU board. Use the photos as a guide.

The header on the daughter board has pins that are more heavy duty than the original Z-80 pins, thus you will need to press very firmly to get the daughter card to be fully inserted into the original Z-80 socket.

Installing the kit

Kit fully Installed

Step 5: Double check your work

Review the steps and double check that Z-80 is properly installed into the daughter card with no bent pins and that it is correctly oriented for pin-1. And that the daughter card is also installed snug into the Z-80 socket with pin-1 matched up.

Step 6: Reinstall CPU, power-up game and enjoy!

Reinstall your board into the cabinet if necessary, and then power-up your game.

Step 7: Optional dip-swtich settings for Freeplay mode

For the new freeplay mode the dip switches located a 10D on the main board need to be set as shown in the picture below !

Freeplay Dip switches

When set correctly the game will display "FREEPLAY" in the bottom right of the screen instead of "Credits"