> Tudna valaki segiteni, hogy hogyan tudok a gameportrol erteket beolvasni (Tur
bo
>  Pascal, vagy Visual Basic nyelvben)?
Ime egy kis angol leiras. Ha csak digitalis gombokat akarsz beolvasni, 
az nagyon egyszeru - de csak 4 van beloluk. Ha nem jojstickot 
hasznalsz, hanem gamepadot, az kisse bonyolultabb. Van egy beepitett 
beolvasofuggveny - ha kell, elkuldom.

  Port 201H is designated as the Game Adapter Port or Joystick Port. 
It is not
  supported by the PC/XT BIOS, but the AT BIOS service INT 15H SubFn 84H
  provides an easy-to-use interface for the adapter.

  It is an analog-to-digital converter which can be used by scientific
  measuring tools and other devices which present an analog (resistive) 
input
  to the interface.  It accepts up to four digital inputs (on/off data 
such as
  the press of a button) and up to four resistive inputs (such as an 
X-ordinate
  of a Joystick or a temperature value from an electronic thermometer).

  The value obtained by an IN from 201H is as diagrammed:

  Í?7??6??5??4Ď?3??2??1??0Ě
  ?B2?B1?A2?A1?By?Bx?Ay?Ax?
  Ë???????????đ???????????Ż
   ??????????? ????????????? Coordinates (resistive, time-dependent inputs)
        ???????????????????? Buttons/Triggers (digital inputs)

  You can read the buttons (digital inputs)  with:

       mov   dx,201H
       out   dx,al      ;initiate transaction; AL=anything
       in    al,dx      ;read bits 4-7 for buttons: 0=pressed, 1=open

  The joysticks, paddles, measuring devices (resistive inputs) are read by
  tracking the time that an X or Y bit stays high (1) after an OUT 
201,xxx. To
  read an individual resistive input (eg, joystick A, X ordinate):

       mov   dx,201H
       out   dx,al      ;initiate transaction  AL=anything
       mov   cx,-1      ;set resistance counter for first loop
gain: in    al,dx      ;read the settings
       inc   cx         ;bump counter
       test  al,1       ;has X-ordinate for joystick A gone low?
       jnz   again      ;loop until it does (when bit=0, we're done)

  The delay value accumulated in CX will indicate the X-ordinate 
position of
  joystick A.  The resulting value is CPU-dependent.  To ensure 
accuracy, it
  would be better to use a hardware timer, rather than a loop counter.