BCG101/dec/ROCKT2.BAS

   7 REM LUNAR1 IS A INTERACTIVE GAME THAT SIMULATES A LUNAR
   8 REM LANDING SIMILAR TO THAT OF THE APOLLO PROGRAM.
   9 REM THERE IS ABSOLUTELY NO CHANCE INVOLVED.
  10 LET Z$="GO"
  15 LET B1=1
  20 LET M=17.95
  25 LET F1=5.25
  30 LET N=7.5
  35 LET R0=926
  40 LET V0=1.29
  45 LET T=0
  50 LET H0=60
  55 LET R=R0+H0
  60 LET A=-3.425
  65 LET R1=0
  70 LET A1=8.84361E-04
  75 LET R3=0
  80 LET A3=0
  85 LET M1=7.45
  90 LET M0=M1
  95 LET B=750
 100 LET T1=0
 105 LET F=0
 110 LET P=0
 115 LET N=1
 120 LET M2=0
 125 LET S=0
 130 LET C=0
 135 IF Z$="YES" THEN 1150
 140 PRINT
 145 PRINT "LUNAR LANDING SIMULATION"
 150 PRINT
 155 PRINT "HAVE YOU FLOWN ON AN APOLLO/LEM MISSION BEFORE#";
 160 PRINT "(YES OR NO)";
 165 INPUT Q$
 170 IF Q$="YES" THEN 190
 175 IF Q$="NO" THEN 205
 180 PRINT "JUST ANSWER THE QUESTION, PLEASE";
 185 GOTO 160
 190 PRINT
 195 PRINT "INPUT MEASUREMENT OPTION NUMBER";
 200 GOTO 225
 205 PRINT
 210 PRINT "WHICH SYSTEM OF MEASUREMENT DO YOU PREFER ?"
 215 PRINT " 1=METRIC     0=ENGLISH"
 220 PRINT "ENTER THE APPROPRIATE NUMBER";
 225 INPUT K
 230 PRINT
 235 IF K=0 THEN 280
 240 IF K=1 THEN 250
 245 GOTO 220
 250 LET Z=1852.8
 255 LET M$="METERS"
 260 LET G3=3.6
 265 LET N$=" KILOMETERS"
 270 LET G5=1000
 275 GOTO 305
 280 LET Z=6080
 285 LET M$="FEET"
 290 LET G3=.592
 295 LET N$=" N.MILES"
 300 LET G5=Z
 305 IF B1=3 THEN 670
 310 IF Q$="YES" THEN 485
 315 PRINT
 320 PRINT " YOU ARE ON A LUNAR LANDING MISSION.  AS THE PILOT OF"
 325 PRINT "THE LUNAR EXCURSION MODULE, YOU WILL BE EXPECTED TO"
 330 PRINT "GIVE CERTAIN COMMANDS TO THE MODULE NAVIGATION SYSTEM."
  335 PRINT " THE ON BOARD COMPUTER WILL GIVE A RUNNING ACCOUNT"
 340 PRINT "OF INFORMATION NEEDED TO NAVIGATE THE SHIP."
 345 PRINT
 350 PRINT
 355 PRINT "THE ATTITUDE ANGLE CALLED FOR IS DESCRIBED AS FOLLOWS-"
 360 PRINT "+ OR -180 DEGREES IS DIRECTLY AWAY FROM THE MOON"
 365 PRINT "-90 DEGREES IS ON A TANGENT IN THE DIRECTION OF ORBIT"
 370 PRINT "90 DEGREES IS ON A TANGENT FROM THE DIRECTION OF ORBIT"
 375 PRINT "0 (ZERO) DEGREES IS DIRECTLY TOWARD THE MOON"
 380 PRINT
 385 PRINT TAB(30);"-180,180"
 390 PRINT TAB(34);"^"
 395 PRINT TAB(27);"-90 < -+- > 90"
 400 PRINT TAB(34);"!"
 405 PRINT TAB(34);"0"
 410 PRINT TAB(23);"<< DIRECTION OF ORBIT <<"
 415 PRINT
 420 PRINT TAB(27);"SURFACE OF MOON"
 425 PRINT
 430 PRINT
 435 PRINT "ALL ANGLES BETWEEN -180 AND 180 DEGREES ARE ACCEPTED."
  440 PRINT
 445 PRINT "1 FUEL UNIT = 1 SEC. AT MAX THRUST"
 450 PRINT "ANY DISCREPANCIES ARE ACCOUNTED FOR IN THE USE OF FUEL"
 455 PRINT "FOR AN ATTITUDE CHANGE."
 460 PRINT "AVAILABLE ENGINE POWER: 0 (ZERO) AND ANY VALUE BETWEEN"
  465 PRINT "10 AND 100 PERCENT."
 470 PRINT
 475 PRINT"NEGATIVE THRUST OR TIME IS PROHIBITED"
 480 PRINT
 485 PRINT
 490 PRINT "INPUT: TIME INTERVAL IN SECONDS ------ (T)"
 495 PRINT "       PERCENTAGE OF THRUST ---------- (P)"
 500 PRINT "       ATTITUDE ANGLE IN DEGREES ----- (A)"
 505 PRINT
 510 IF Q$="YES" THEN 535
 515 PRINT "FOR EXAMPLE:"
 520 PRINT "T,P,A?10,65,-60"
 525 PRINT "TO ABORT THE MISSION AT ANY TIME, ENTER 0,0,0"
 530 PRINT
 535 PRINT "OUTPUT: TOTAL TIME ELAPSED IN SECONDS"
 540 PRINT "        HEIGHT IN ";M$
 545 PRINT "        DISTANCE FROM LANDING SITE IN ";M$
 550 PRINT "        VERTICAL VELOCITY IN ";M$;"/SECOND"
 555 PRINT "        HORIZONTAL VELOCITY IN ";M$;"/SECOND"
 560 PRINT "        FUEL UNITS REMAINING"
 565 PRINT
 570 GOTO 670
 575 PRINT
 580 PRINT "T,P,A";
 585 INPUT T1,F,P
 590 LET F=F/100
 595 IF T1<0 THEN 905
 600 IF T1=0 THEN 1090
 605 IF ABS(F-.05)>1 THEN 945
 610 IF ABS(F-.05)<.05 THEN 945
 615 IF ABS(P)>180 THEN 925
 620 LET N=20
 625 IF T1<400 THEN 635
 630 LET N=T1/20
 635 LET T1=T1/N
 640 LET P=P*3.14159/180
 645 LET S=SIN(P)
 650 LET C=COS(P)
 655 LET M2=M0*T1*F/B
 660 LET R3=-.5*R0*((V0/R)^2)+R*A1*A1
 665 LET A3=-2*R1*A1/R
 670 FOR I=1 TO N
 675 IF M1=0 THEN 715
 680 LET M1=M1-M2
 685 IF M1>0 THEN 725
 690 LET F=F*(1+M1/M2)
 695 LET M2=M1+M2
 700 PRINT "YOU ARE OUT OF FUEL"
 705 LET M1=0
 710 GOTO 725
 715 LET F=0
 720 LET M2=0
 725 LET M=M-.5*M2
 730 LET R4=R3
 735 LET R3=-.5*R0*((V0/R)^2)+R*A1*A1
 740 LET R2=(3*R3-R4)/2+.00526*F1*F*C/M
 745 LET A4=A3
 750 LET A3=-2*R1*A1/R
 755 LET A2=(3*A3-A4)/2+.00526*F1*F*S/(M*R)
 760 LET X=R1*T1+.5*R2*T1*T1
 765 LET R=R+X
 770 LET H0=H0+X
 775 LET R1=R1+R2*T1
 780 LET A=A+A1*T1+.5*A2*T1*T1
 785 LET A1=A1+A2*T1
 790 LET M=M-.5*M2
 795 LET T=T+T1
 800 IF H0<3.287828E-04 THEN 810
 805 NEXT I
 810 LET H=H0*Z
 815 LET H1=R1*Z
 820 LET D=R0*A*Z
 825 LET D1=R*A1*Z
 830 LET T2=M1*B/M0
 835 PRINT TAB(1);T;TAB(10);H;TAB(23);D;
 840 PRINT TAB(37);H1;TAB(49);D1;TAB(60);T2
 845 IF H0<3.287828E-04 THEN 880
 850 IF R0*A>164.4736 THEN 1050
 855 IF M1>0 THEN 580
 860 LET T1=20
 865 LET F=0
 870 LET P=0
 875 GOTO 620
 880 IF R1<-8.21957E-04 THEN 1020
 885 IF ABS(R*A1)>4.931742E-04 THEN 1020
 890 IF H0<-3.287828E-04 THEN 1020
 895 IF ABS(D)>10*Z THEN 1065
 900 GOTO 995
 905 PRINT
 910 PRINT "THIS SPACECRAFT IS NOT ABLE TO VIOLATE THE SPACE-";
 915 PRINT "TIME CONTINUUM."
 920 GOTO 575
 925 PRINT
 930 PRINT "IF YOU WANT TO SPIN AROUND, GO OUTSIDE THE MODULE";
 935 PRINT "FOR AN E.V.A"
 940 GOTO 575
 945 PRINT
 950 PRINT "IMPOSSIBLE THRUST-VALUE ";
 955 IF F<0 THEN 985
 960 IF F-.05<.05 THEN 975
 965 PRINT "TOO LARGE"
 970 GOTO 575
 975 PRINT "TOO SMALL"
 980 GOTO 575
 985 PRINT "NEGATIVE"
 990 GOTO 575
 995 PRINT
1000 PRINT "TRANQUILITY BASE HERE -- THE EAGLE HAS LANDED"
1005 PRINT "CONGRATULATIONS - THERE WAS NO SPACECRAFT DAMAGE"
1010 PRINT "YOU MAY NOW PROCEED WITH SURFACE EXPLORATION."
1015 GOTO 1100
1020 PRINT
1025 PRINT "CRASH !!!!!!!!!!!"
1030 PRINT "YOUR IMPACT CREATED A CRATER";ABS(H);M$;" DEEP"
1035 X1=SQR(D1*D1+H1*H1)*G3
1040 PRINT "AT CONTACT YOU WERE TRAVELING";X1;N$;"/HR."
1045 GOTO 1100
1050 PRINT
1055 PRINT "YOU HAVE BEEN LOST IN SPACE WITH NO HOPE OF RECOVERY"
1060 GOTO 1100
1065 PRINT "YOU ARE DOWN SAFELY - "
1075 PRINT
1080 PRINT "BUT MISSED THE LANDING SITE BY";ABS(D/G5);N$
1085 GOTO 1100
1090 PRINT
1095 PRINT "MISSION ABORTED"
1100 PRINT
1105 PRINT "DO YOU WANT TO FLY IT AGAIN ? (YES OR NO)";
1110 INPUT Z$
1115 IF Z$="YES" THEN 20
1120 IF Z$="NO" THEN 1130
1125 GOTO 1105
1130 PRINT
1135 PRINT "TOO BAD, THE SPACE PROGRAM HATES TO LOSE EXPERIENCED";
1140 PRINT " ASTRONAUTS."
1145 STOP
1150 PRINT
1155 PRINT "OK, DO YOU WANT THE COMPLETE INSTRUCTIONS OR THE INPUT-"
1160 PRINT "OUTPUT STATEMENTS ?"
1165 PRINT "1=COMPLETE INSTRUCTIONS"
1170 PRINT "2=INPUT-OUTPUT STATEMENTS"
1175 PRINT "3=NEITHER"
1180 INPUT B1
1185 LET Q$="NO"
1190 IF B1=1 THEN 205
1195 LET Q$="YES"
1200 IF B1=2 THEN 190
1205 IF B1=3 THEN 190
1210 GOTO 1165
1215 END