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 HOW TO MODIFY A SEGA GENESIS CONTROLLER No.1650 FOR THE VECTREX CONSOLE.
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AUTHOR: Graham.J.Percy  
EMAIL:  gjp57@yahoo.com
PHONE:  + (61) 03 5978 7198

FAQ Version 1.1, 26th August 2002.

Copyright (c) 2002 Graham.J.Percy

All rights reserved. This document may be reproduced, in whole or in part,
provided the copyright notice remains intact and no fee is charged.
The data contained herein is provided for informational purposes only.
No warranty is made with regards to the accuracy of the information.

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INTRODUCTION

Earlier this year I made the happy discovery of a Vectrex console in a
nearby opportunity shop (minus joystick & cover). I purchased this for the
princely sum of A$2.00 and vowed to find a compatible joystick. Not so easy.

A search of the internet revealed a detailed and well written posting 
(circa 1995) by Brian Holscher in which wiring schematics have been provided
for Genesis pad conversion. I have used those schematics for a straight
conversion (without micro-controller) to rewire the No.1650 controller. 
My thanks go to Brian Holscher!

The printed circuit board of the modified controller has the part number
702676012-BN. Other PCBs such as part No.701675001-01 may not be suitable.   

The modified pad works great, with the built-in game at least!

An accompanying colour diagram (sega-vec.gif) is required to interpret the
following instructions:-

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INSTRUCTIONS:-

1/ Remove the existing IC chip and all resistors from the printed circuit
   board (PCB). Do not remove the controller lead. (This will be left exactly
   as-is).

2/ Cut the PCB circuit traces at locations #1 through #5. (eg. Use the edge
   of a small triangular file).

   -  Cuts #1 and #2 are on the underside of the PCB. (So are the large
      purple and grey areas).

   -  Cut #3 breaks four seperate traces.

3/ Pin-drill the PCB and clean to bare metal around the holes. 2 places.
   Drill close to the trace edge as shown to avoid fouling of wires on
   the plastic controller case.

4/ Clean PCB traces to bare metal then bridge with solder. 2 places.

5/ Solder patch cables in locations shown. (eg. use 0.6mm insulated solid 
   core bell-wire). 7 places.

6/ Solder in place 1/4 W resistors. Four at 3.3K Ohm (Org,Org,Red) and four
   at 10K Ohm (Brn,Blk,Org). Solder both sides of the PCB at the location 
   identified by "Step #6" on the diagram.

7/ Well, that's it! Just trim the controller lead plug to fit the Vectrex
   joystick socket and you're done. 


                                  Trim
                                    |
                                    |
                                    V                         1.6mm
                        _________________________  ___________|_
                       |   ___________________   | ___________ _
                       |   \  O  O  O  O  O  /   |            |
                       |    \               /    |
              ________ |     \  O  O  O  O /     |   
               |        \      ------------     /        
              5mm      |  \                   / \         
              _|_______|___ \_______________/    \            
                       |    |                     \             
                       |    |                      \        
                       |----|<---  5mm             Trim x 2 places


                        End view of controller plug.
   
  


                                                     
                      Region to trim = 8mm --->|---|      
                                               |   |       
                          _____________________|___|
   )_____________________|                         |-----.
  (______________________|           Plug          |     | 
   )                     |_________________________|-----'



                        Side view of controller plug. 


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FILE:-  SEGA-VEC.TXT