Asteroids High Score Save Kit -- Installation Guide
Step 0: Make sure your game is fully working
Before installing this kit, make sure your Asteroids
game is fully functional.
This kit can only work in a fully functional game.
This is also a good time to check to see what revision
of asteroids the game is (Rev1 or Rev2).
How to check revision level.
This kit is only compatible with Rev2 vector roms.
If you game is Rev1 you will need to install a replacement
Rev2 vector rom (provided).
See step 6 for vector rom instructions.
Step 1: 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 2: Locate and remove the game PCB
For Asteroids upright, the game PCB is usually attached to the left
side of the cabinet (as viewed from the front).
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.
Asteroids game PCB
Step 3: 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 at C3
It is the only 40 pin chip on the boardset.
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 inadvertantly bent, you will need to straighten
them out before the next step.
Needle nose pliers work the best for this.
Asteroids 6502 CPU location
6502 CPU Removed
Step 4: Insert the 6502 CPU into the daughter card
Remove the REV2 vector eprom from the 40 pin socket on
the high score kit and set it aside.
It was inserted into the kit only for shipping purposes to insure
that none of the pins got bent.
Insert the just removed 6502 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 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 labelled on the kit pcb with a "1".
If the 6502 chip is installed backwards it can cause
permanent damage to the 6502 chip.
Click images for a larger view
Asteroid HISAVE kit
Kit with 6502 installed
Step 5: Insert the daughter card into the boardset
Insert the 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.
Use the photos as a guide.
Step 6: [Optional] Replace the Vector ROM
The asteroids high score save kit is based upon the REV2
software version of the asteroids game.
This requires that the vector rom on the asteroids board
also be a REV2 vector rom.
The vector rom is located at chip location N/P3 and is
a 24 pin device on the same column as the 6502 CPU.
It is very well possible that you already have a REV2 vector
rom on your board in which case you should skip this step.
You can check the revision by looking at the number on the chip.
REV2 vector rom is identified by 035127.02 or by
looking at the copyright notice at the bottom of the screen
while the game is running.
How to check revision level.
A REV2 vector eprom is included as part of the kit, however
it is suggested that you only install this chip if you have
a REV1 vector eprom.
That is, "If it aint broke, don't fix it".
To install the REV2 eprom, simply remove the old REV1 vector rom
at chip location N/P3 and replace it with the one provided.
Again pay close attention to the pin 1 orientation.
If this chip is installed backwards it can cause
permanent damage to the chip!
Step 7: 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.
And that the daughter card is also installed snug into the
6052 CPU socket at C3 with pin-1 matched up.
Apply the same checks to the vector rom installed at N/P3
as part of step 6.
REPEAT: If any of these devices are installed backwards
it can cause permanent damage to the devices!
Step 8: Powerup and game and enjoy!
Reinstall your board into the cabinet, hookup the edge connector
with the original orientation 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.
Easy to clear out the high scores when desired.
Simply put the game into selftest (using the cabinet selftest switch).
Once in selftest mode, press (and hold) all four of the following
buttons (left,right,fire and thrust).
The screen will imediately show "ERASED" indicating the high scores
have been cleared out.
This is the same procedure used by Asteroids Deluxe to reset the
high score table.
See Clearing High Score table for detailed directions.
As a side note, if you want, you can also remove the
old code eproms.
These are located at the edge of the board near the 6502 CPU location.
See code eprom picture.