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MODIFYING A GAME JOYSTICK TO BE USED WITH THE CELESTRON COMPUSTAR

INTRODUCTION

1. This page will go through the steps of modifying a game joystick so that it can be

used with the Compustar computer. It is so much easier to use a joystick instead of the

computer's motion control keys because a joystick has proportional control over the motion

of the telescope. That means that the telescope will move faster the more you deflect the

stick. You can count 30 or more different speeds as you advance the stick. This

proportional control makes it particularly easy when performing finer movement. There will

be no need to make multiple quick presses of the motion control keys to position the

telescope where you want it.

2. I believe that the greatest use of the joystick is realized when you are looking

through the eyepiece. Before I had a joystick I spent a great amount of time correcting the

telescope movement because I pressed the wrong motion key to start with. The joystick can

be held backwards and/or inverted so that your hand movement is intuitive as you move

through the star fields.

CHOOSING A JOYSTICK

3. The original Celestron joystick was simply a joystick with

two buttons. One button was to toggle between the "SET" and

"SLEW" speed rates, and the other button was the same as

pressing the "SYNC" command key. The joystick that you choose

does not have to be any more elaborate than that. Today's game

joysticks are much more sophisticated. You may in fact find it

difficult to locate a new but simple joystick. I looked in six

different stores before I found the one in the photo. I

purchased it at a discount department store for nine dollars.

4. Another thing to look for are trim controls. These

controls will make it easier to set up the joystick so that you

can achieve maximum speed in all directions.

5. The inside of the joystick is also important. Most

joysticks of this type are basically the same inside, however

some are designed poorly. I located an old TANDY joystick at a

computer surplus store that looked promising, but when I opened

up the bottom, a couple of large springs snapped like a mouse

trap and small parts were launched across the room. I still

haven't found them all.

6. This particular joystick is very adaptable to modification. It has nice large linear

potentiometers (Pots) with tabs that you can solder wires to. The red circle in the left

photo shows the "X" axis Pot pulled out of its holder. It also has a Printed Circuit Card

(PCC) that is used as an interface between the internal wiring of the joystick and the

wiring of the cord. This PCC will be great for connecting a new cord for the Compustar.

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Résumé du contenu

Page 1

MODIFYING A GAME JOYSTICK TO BE USED WITH THE CELESTRON COMPUSTAR INTRODUCTION 1. This page will go through the steps of modifying a game joystick

Page 2

MODIFYING THE JOYSTICK 7. The Compustar computer has three DB-9S connectors located on the front edge. The basic Compustar has nothing connected t

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14. If you do not have a multi-meter or cannot borrow one, you can still easily perform a continuity check by using a battery and light bulb. Select

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already connected together. Also there is a place at the top were two other wires can be connected together. These circuits on the PCC can be used t

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