Donkey Kong 3 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 typically not 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
Donkey Kong 3 boardset consists of two boards (video and CPU).
The CPU board is the one that has the battery holder and
Donkey Kong 3 CPU board
Step 2: Remove the Z80-CPU chip
Locate and remove the Z80 chip on the CPU board.
Use the above photos to assist in locating it.
See Z80 Chip Identification
for additional information.
The Z80-CPU chip is a 40 pin (large) chip, located at 5C
directly above eprom 7C.
Do not get this chip confused with the Z80-DMA controller
located next to the Z80-CPU.
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.
Donkey Kong 3 Z80-CPU location
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.
Donkey Kong 3 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.
And that the daughter card is also installed snug into the
Z80-CPU socket at 5E 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.