Visit Atarimax Store


Free-Net Logo
The Atari SIG Historical Archive
Created and hosted by: atarimax.com
[ HOME | GO ATARI | 8-BIT | ST/TT | PORTFOLIO | LYNX | JAGUAR | LIBRARY ]


Article #50 (75 is last):
From: JTKIRK@urp.edu.pe
Newsgroups: freenet.sci.comp.atari.prog.8bit.resource
Subject: Atari Controller Notes
Reply-To: JTKIRK@urp.edu.pe
Posted-By: xx004 (aa853 - Craig Lisowski)
Edited-By: xx004 (aa853 - Craig Lisowski)
Date: Thu Feb  1 05:33:22 1996

These are my notes on different types of ATARI controllers.
I decided to put them together after I read a posting by Mark Howard about
the steering controllers and trackball on some ATARI 8-bit page.

Joysticks
---------

     circuital diagram                           pin assignments
     -----------------                           ---------------
                                                  ___________
    org   blk                                     \5 4 3 2 1/
     |     |                                       \9_8_7_6/
     O-----+                                       
           |    wht
           |     |                               pin wire 
           +-----O                                #  col  function
           |                                     -----------------
           +-----\                                1  wht  ^ (up)
           |     |                                2  blu  v (down)
      grn -O     +-----O- bwn                     3  grn  < (left)
                 |                                4  bwn  > (right)
                 |                                6  org  fire
                 |                               (7  red  +5V) (*)
                 O                                8  blk  GND
                 |
                blu                              (*) only used in joysticks
                                                     with autofire switch

     autofire circuit
     ----------------

                   red                    firing frequency:
                    |
         /----------+                     f=1,44/[(R1+2*R2)*C]
         |          |
         Z       /--+                     ( T=0,694*(R1+2*R2)*C )
      R1 Z    .__|__|__.
         |    |  8  4  |                  
         +----7        |                  typical values:
         |    |        3----- org
         Z    | LM 555 |                  C1=0,42 nF
      R2 Z  /-6        5----\             R1=10 K
         |  | |        |    |             R2=10 K
         +--+-2        |    = C1          C=100 nF
         |    |___1____|    |
         |        |         |            (These are the values I selected.)
         \---||---+---------/
             C    |
                 blk


Paddles
-------

     circuital diagram                           pin assignments
     -----------------                           ---------------
                                                  ___________
             pushbutton          R                \5 4 3 2 1/
               __I__        /---NNN--              \9_8_7_6/
               o   o        |    ^                 
               |   |        |    |               pin wire
     L        grn blk      yel  vio               #  col  function
    ------------------------------------         -----------------
     R        bwn blk      yel  red               3  grn  L button
                                                  4  bwn  R button
                                                  5  red  R paddle
         R=1M                                     7  yel  +5V
        (R=500K for Commodore)                    8  blk  GND
                                                  9  vio  L paddle


Keyboard controllers/Video touch pad
------------------------------------

     circuital diagram                           pin assignments
     -----------------                           ---------------
                                                  ___________
     grn  vio  wht       blu                      \5 4 3 2 1/
      |    |    |         |                        \9_8_7_6/
      +-NN-+-NN-+         |
      | R    R  |         |                      pin wire
      O---------O---------O----- bwn              #  col  function
      |         |         |                      -----------------
      |         |         |                       1  bwn  row 1
      O---------O---------O----- red              2  red  row 2
      |         |         |                       3  org  row 3
      |         |         |                       4  yel  row 4
      O---------O---------O----- org              5  grn  col 1
      |         |         |                       6  blu  col 3
      |         |         |                       7  vio  +5V
      O---------O---------O----- yel              9  wht  col 2

          R=4,7K

     Readings
     --------

     The following program appeared in COMPUTE!, 2/87, "Readers Feedback"
     section, page 30. It allows to read a keyboard controller (or video
     touch pad, since they are internally identical) connected to port 1:

     1 GRAPHICS 0
     10 DIM ROW(3),I$(13),BUTTON$(1)
     30 GOSUB 6000
     60 POSITION 2,7:PRINT "CONTROLLER # 1:";
     80 GOSUB 7000:POSITION 19,7:PRINT BUTTON$;
     120 GOTO 80
     6000 REM
     6010 POKE 54018,48:POKE 54016,255:POKE 54018,52:POKE 54016,221
     6030 ROW(0)=238:ROW(1)=221:ROW(2)=187:ROW(3)=119
     6040 I$=" 123456789*0#"
     6050 RETURN
     7000 PORT=54016
     7010 P=1:PAD=0
     7020 FOR J=0 TO 3
     7030 POKE PORT, ROW(J)
     7040 FOR I=1 TO 10:NEXT I
     7050 IF PADDLE(PAD+1)>10 THEN P=J+J+J+2:GOTO 7090
     7060 IF PADDLE(PAD)>10 THEN P=J+J+J+3:GOTO 7090
     7070 IF STRIG(0)=0 THEN P=J+J+J+4:GOTO 7090
     7080 NEXT J
     7090 BUTTON$=I$(P,P)
     7100 RETURN


STM1 Mouse
----------

     circuital diagram                           pin assignments
     -----------------                           ---------------
                                                  ___________
     (Are you nuts? It consists of                \5 4 3 2 1/
      23 resistors, 2 capacitors,                  \9_8_7_6/
      2 movement sensors and an
      LM 339N quad-comparator IC!)               pin wire
                                                  #  col  function
      Well, at least the buttons:                -----------------
                                                  1  bwn  L/R sense
         L button    R button                     2  org  L/R reference
           __I__       __I__                      3  grn  U/D sense
           o   o       o   o                      4  blu  U/D reference
           |   |       |   |                      6  yel  L button
          yel blk     wht blk                     7  red  +5V
                                                  8  blk  GND
                                                  9  wht  R button

     readings
     --------

     The STM1 Mouse works as an inverted trackball (which is, in fact, what
     it is). The left button corresponds to the joystick trigger; the right
     button must be read in more or less the same way as the keyboard
     controllers, I guess (I had to return the mouse I borrowed before
     finishing my analysis).

     Mouse rolling forwards (up)     Mouse rolling backwards (down)

          U/D U/D                         U/D U/D
          REF SNS                         REF SNS
          -------                         -------
            0 1                             0 0
            1 1 <-\                         1 0 <-\
            0 1 --/                         0 0 --/
            ...                             ...


     Mouse rolling left              Mouse rolling right

          L/R L/R                         L/R L/R
          REF SNS                         REF SNS
          -------                         -------
            0 1                             0 0
            1 1 <-\                         1 0 <-\
            0 1 --/                         0 0 --/
            ...                             ...

     I tried to write a resident handler which should convert the mouse
     readings into joystick values and put them into the shadow register
     for joystick 2 (remember that on the ATARI XL/XE only joysticks 0
     and 1 are in effect, and 2 & 3 just contain repeats of 0 and 1).
     Then, if you read STICK(2), you would have the translated values;
     STRIG(2) would give you the status of the right mouse button; and
     for the left button, you would still use STRIG(0). Unfortunately,
     the routine got hanged sooner or later, and I had to return the
     borrowed mouse before I could finish debugging it. Maybe I can
     borrow another and resume the task...


     Marco Antonio  Checa  Funcke
     Botoneros 270
     Lima 33
     Peru

     reachable at jtkirk@urp.edu.pe


Visit Atarimax Store