5 DP = .10: REM Deadzone Percentage
10 XLEFT = 0:YUP = 0:XRIGHT = 279:YBOT = 159: REM Screen Bounds 
15 REM Set target box coordinates
20 HALF = XRIGHT / 2:D1 = INT (HALF - (HALF * DP)):D2 = INT (HALF + (HALF * DP))
25 HALF = YBOT / 2:D3 = INT (HALF - (HALF * DP)):D4 = INT (HALF + (HALF * DP))
30 HGR : HCOLOR= 3
35 REM Draw edge box
40 X1 = XLEFT:Y1 = YUP:X2 = XRIGHT:Y2 = YBOT: GOSUB 2000:X1 = X1 + 1:X2 = X2 - 1:Y1 = Y1 + 1:Y2 = Y2 - 1: GOSUB 2000
50 P0 = PDL (0):P1 = PDL (1): GOSUB 3000
55 PRINT P0,P1
60 GOTO 50
2000 HPLOT X1,Y1 TO X1,Y2: HPLOT X1,Y2 TO X2,Y2: HPLOT X2,Y2 TO X2,Y1: HPLOT X2,Y1 TO X1,Y1
2002 RETURN 
3000 X = INT (P0 * 274 / 255 + 2):Y = INT (P1 * 154 / 255 + 2)
3010 X1 = X:X2 = X + 1:Y1 = Y:Y2 = Y1 + 1: GOSUB 2000
3020 GOSUB 4000: HCOLOR= 0: GOSUB 2000: HCOLOR= 3
3050 RETURN 
4000 HPLOT D1,D3 TO D1,D4: HPLOT D1,D4 TO D2,D4: HPLOT D2,D4 TO D2,D3: HPLOT D2,D3 TO D1,D3
4010 RETURN : REM End Draw Target Box