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[AQUARIUS] Micro-Expander: RAM, ROM, AY-8910 and more!


Bruce Abbott

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On 6/25/2017 at 7:18 AM, Bruce Abbott said:

Aquaman requested a cable to connect Aquarius gamepads to my Micro-Expander. This turned out to be a bit trickier than I thought because the mini-expander schematic doesn't show which pins the port bits are connected to. I managed to figure it out from a photo of the PCB and a post by jaybird3rd. Then I 'just' had to map the Micro-expander's 20 pin connector pins to the D9 joystick socket.

Micro-Expander 20 pin parallel Port Socket (external view)
==========================================================

    .---------------------- KEY -----------------------.     
    | PB0  PB2  PB4  PB6  +5V  PA7  PA5  PA3  PA1  GND |
    |  19   17   15   13   11    9    7    5    3    1 |
    |                                                  |
    |  20   18   16   14   12   10    8    6    4    2 |
    | GND  PB1  PB3  PB5  PB7  +5V  PA6  PA4  PA2  PA0 |
    '--------------------------------------------------'
                           

               D9 Socket (external view)
               =========================

                 .----------------.
                 \ 1  2  3  4  5  /
                  \  6  7  8  9  /
                   '------------'


    D9         D9       20P    20P    PORT A/B    wire
  ATARI     AQUARIUS    JOY1   JOY2   RAD38910    color
  ======    ========    ====   ====   ========    =====
  2 DN      9 P5/DN       2     19      D0        Slate  
  4 RT      8 P1/RT       3     18      D1        White
  1 UP      7 P13/UP      4     17      D2        Black
  3 LT      6 P9/LT       5     16      D3        Brown
    -       5 P2-15       6     15      D4        Red
  5 B IN    4 K4          7     14      D5        Orange
  6 FIRE    3 K1          8     13      D6        Yellow
  9 A IN    2 K2-6        9     12      D7        Green
  8 GND     1 GND         1     20      GND       Violet
  7 +5V       -          10     11      +5V       Blue


                            
Aquarius Joypad #1 to Micro-Expander
====================================
 
Func  D9   Color   UEX 20P  
====  ==   ======  =======       
GND    1   Violet     1
K2-6   2   Green      9  
K1     3   Yellow     8   
K4     4   Orange     7   
P2-15  5   Red        6
LEFT   6   Brown      5   
UP     7   Black      4   
RIGHT  8   White      3
DOWN   9   Slate      2   
 
 

Atari Joystick to Micro-Expander  
================================
 
Func   D9    Color    UEX 20P  
====   ==    ======   =======       
UP      1    Black       4  
DOWN    2    Slate       2  
LEFT    3    Brown       5  
RIGHT   4    White       3  
B IN    5    Green       9  
FIRE    6    Yellow      8  
+5V     7    Blue       10  
GND     8    Violet      1  
A IN    9    Green       7

Wire colors refer to the ribbon cable I used to make the adapter. The cable is reversed on each side of the 20 pin IDC plug, so the colors are the same for both joysticks. If you only have one gamepad or joystick then only the right-hand cable and D9 socket are required. Photos below show the adapter I made for Aquarius gamepads. An Atari joystick cable would be the same except for connections to the D9 sockets.

 

I also made an Atari joystick adapter with the 20 pin plug and D9 socket connected via a small piece of matrix board. Using this I was able to play some games with my joystick, but Night Stalker needs 4 buttons to fire in different directions (perhaps it can be hacked to work with a single fire button?).

 





 

Is this correct? Are those pin numbers for a male of female connectori?

 

image.thumb.jpeg.540c7cc9751457cfb0c0fb9fcf5565c8.jpeg

Edited by utri007
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