Energy Field
You are at the edge of Time, closely pursued by a fleet of alien craft who are out to steal your ship's power. However you have a trick or two up your sleeve. You have the capacity to guard the ends of the time tunnel by setting up energy fields at each of the four open ends of the system. If you attempt to set up a force field anywhere other than at the ends of the time tunnel, the force will feed-back and destroy you. Likewise, if you set up a field at the end of an unoccupied tunnel you are finished. Passive cruiser commanders who allow too many aliens through will find their power drained and the game over.
10 REM ENERGY FIELD.
20 REM @ PAUL STANLEY.
30 MODE 1:BORDER 0:INK 0,0:INK 1,24:INK 2,20:INK 3,7:WINDOW #1,1,40,1,25:PAPER # 1,0:PEN #1,1:CLS #1
40 GOSUB 1700
50 GOSUB 1570
60 CLS
70 GOSUB 1600
80 H=0
90 WINDOW #0,5,36,1,25:PAPER #0,0:PEN #0 ,1:CLS #0
100 GOSUB 1340
110 GOSUB 1510
120 LOCATE 1,1:PRINT"SCORE:";:LOCATE 23, 1:PRINT"HIGH:";:LOCATE 27,23:PRINT"POWER
130 LOCATE 29,1:PRINT MIDS(STR$(H),2) 140 PEN 2:LOCATE X+1,Y+1:PRINT CHR$(238) ;CHR$(239);:PEN 1
150 IF LI<=1 THEN 1280
160 P=P-0.05:LOCATE 7,1:PEN 2:PRINT MID$ (STR$(S),2);:PEN 1:G=1:SS=INT(RND*4)+1:0 N SS GOTO 240,370,500,630
170 FOR D=1 TO P: PEN 0:LOCATE X+1,Y+1:PR INT CHR$(238);CHR$(239);:PEN 1