home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
DP Tool Club 19
/
CD_ASCQ_19_010295.iso
/
dos
/
prg
/
pas
/
swag
/
joystick.swg
/
0002_JOYSTCK2.PAS.pas
< prev
next >
Wrap
Pascal/Delphi Source File
|
1993-05-28
|
4KB
|
109 lines
{
Anyone know how to read the Joystick.... I only need Joy(1) read....
I have used 1 Procedure i d/led, but all it did was tell me if the buttons
were down (it didnt work in telling me which direction (it should of))
}
Program JOYSTICK;
Uses Crt, Dos;
(*
WRITTEN BY JAMES P. MCADAMS - 25 DECEMBER 1984
Program DEMONSTRATinG THE USE of TURBO PASCAL to ACCESS THE
IBM-PC GAME CONTROL ADAPTER. THE TWO Function CALLS ARE EACH
CompLETE in ITSELF. EITHER ONE or BOTH CAN BE MOVED to ANY
Program THAT NEEDS THE USE of JOYSTICKS or PADDLES.
*)
Var
I: Integer;
TEMP: Byte;
Function BUTtoN_PRESSED (WHICH_ONE: Char): Boolean;
(* RETURN True if THE BUTtoN IS PRESSED *)
Const
JOYPorT = $201; (* LOCATION of THE GAME PorT *)
Var
MASK: Byte;
begin
if not (WHICH_ONE in ['A'..'D']) then WHICH_ONE := 'A';
Case WHICH_ONE of
'A': MASK := 16;
'B': MASK := 32;
'C': MASK := 64;
'D': MASK := 128;
end;
BUTtoN_PRESSED := (PorT [JOYPorT] and MASK) = 0;
end; (* BUTtoN_PRESSED *)
Function JOYSTICK_POS (WHICH_ONE: Char): Integer;
(*
With A KRAFT JOYSTICK, VALUES RETURNED ARE in THE RANGE 4 to ABOUT
140. if YOUR MACHinE RUNS FASTER THAN A STandARD IBM-PC or if YOU
MODifY YOUR GAME ADAPTER CARD With BIGGER CAPACItoRS, YOU WILL
GET LARGER COUNTS and YOU MUST MODifY "MAXCOUNT".
CALLinG A JOYSTICK THAT IS not in USE or ONE THAT HAS GONE
OVER-RANGE (COUNT REACHED MAXCOUNT) YIELDS A VALUE of 0.
*)
Const
MAXCOUNT = 2000; (* MODifY THIS if YOU CAN GET LONGER COUNTS *)
JOYPorT = $201; (* For inForMATION ONLY: LOC of GAME inPUT PorT *)
Var
COUNTER: Integer;
MASK: Byte;
begin
if not (WHICH_ONE in ['A'..'D']) then WHICH_ONE := 'A';
Case WHICH_ONE of
'A': MASK := 1;
'B': MASK := 2;
'C': MASK := 4;
'D': MASK := 8;
end;
(*
THIS ASSEMBLY CODE CAUses THE CX REGISTER to COUNT doWN FROM "MAXCOUNT"
toWARD ZERO. WHEN CX REACHES ZERO or WHEN THE ONE-SHOT ON THE GAME
ADAPTER TIMES OUT, THE LOOPinG StoPS and "COUNTER" IS ASSIGNED THE NUMBER
of COUNTS THAT toOK PLACE. MAXCOUNT SHOULD BE CHOSEN SO THAT CX NEVER
REACHES 0 SO THAT THE USABLE RANGE of THE JOYSTICK WILL not BE LIMITED.
*)
Inline (
$B9/MAXCOUNT/ (* MOV CX,MAXCOUNT inITIALIZE doWN-COUNTER *)
$BA/JOYPorT/ (* MOV DX,JOYPorT PorT ADDR of JOYSTICKS *)
$8A/$A6/MASK/ (* MOV AH,MASK[BP] MASK For DESIRED 1-SHOT *)
$EE/ (* OUT DX,AL START THE ONE-SHOTS *)
$EC/ (* READ: in AL,DX READ THE ONESHOTS *)
$84/$C4/ (* TEST AL,AH CHECK DESIRED ONE-SHOT *)
$E0/$FB/ (* LOOPNZ READ Repeat Until TIMED OUT *)
$89/$8E/COUNTER); (* MOV COUNTER[BP],CX THIS MAKES CX AVAIL-*)
(* ABLE to TURBO *)
if COUNTER = 0
then JOYSTICK_POS := 0 (* OVER-RANGE or not in USE *)
else JOYSTICK_POS := MAXCOUNT - COUNTER;
end; (* JOYSTICK_POS *)
begin (***** DEMO Program - MAin CODE *****)
ClrScr;
GotoXY (1, 2);
WriteLN ('JOYSTICKS':10, 'BUTtoNS':10);
Write ('A':5, 'B':5, 'A':5, 'B':5);
While True do (* PRESS CTRL C to StoP THE Program *)
begin
GotoXY (1, 5);
Write (JOYSTICK_POS ('A'):5, JOYSTICK_POS ('B'):5);
if BUTtoN_PRESSED ('A')
then Write ('PRES':5)
else Write ('UP':5);
if BUTtoN_PRESSED ('B')
then Write ('PRES':5)
else Write ('UP':5);
end;
end.