Zaxxon High Score Save Kit -- Installation Guide
Step 0: Turn off power to the game
While it may be possible to install this kit without removing your
board from its cabinet, 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 rehookup the game PCB afterwards.
Take note of which side of the PCB edge connector is facing the
parts side of the board and which side faces the solder side,
This connector is may not be keyed and can be
inadvertantly 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
Zaxxon boardset consists of two boards (video and CPU).
The CPU board is the top board and has the large heat sink
in the corner near the edge connector.
Zaxxon CPU board
Step 2: Remove the Z80-CPU chip
Locate and remove the Z80-CPU chip on the CPU board.
Use the images below to assist in locating it.
See Z80 Chip Identification
for additional information.
The Z80-CPU chip is a 40 pin (large) chip, located at U24.
Do not get this chip confused with the 8255 sound controller
located next to the Z80-CPU at U23.
Remove the chip 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 inadvertantly bent, you will need to straighten
them out before the next step.
Needle nose pliers work the best for this.
Zaxxon Z80-CPU location (U24)
Step 3: Insert the Z80-CPU into the daughter card
Insert the just removed Z80-CPU 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 Z80-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 labelled on the kit pcb with a "1".
Click images for a larger view
Z80 CPU Chip
High Score Daughter Card
Step 5: Insert the daughter card into the CPU board
Insert the daughter card back into the Z80-CPU socket on the
CPU board where the Z80-CPU chip was originally removed from.
Again, make sure pin-1 of the Z80/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 Z80-CPU pins, thus you will need
to press very firmly to get the daughter card to be fully
inserted into the original Z80-CPU socket.
Zaxxon with HS kit installed
Step 6: Double check your work
Review the steps and double check that Z80-CPU is properly
installed into the daughter card with no bent pins and that
it is correctly oriented for pin-1. (Pin-1 should be on the
edge closest to the edge of the PCB).
Also check that the daughter card is also installed snug into
the Z80-CPU socket at U24 with pin-1 matched up.
Step 7: Powerup and game and enjoy!
Reinstall your board into the cabinet if necessary, and then
powerup your game.
If the game does not come up, turn power off immediately,
double check your work, and read over the
trouble shooting section.