BCG101/dec/ROCKET.BAS

2 PRINT "THIS IS A COMPUTER SIMULATION OF AN APOLLO LUNAR"
3 PRINT "LANDING CAPSULE."\PRINT\PRINT
4 PRINT "THE ON-BOARD COMPUTER HAS FAILED (IT WASN'T MADE BY"
5 PRINT "DIGITAL) SO YOU HAVE TO LAND THE CAPSULE MANUALLY"
6 PRINT\PRINT "SET BURN RATE OF RETRO ROCKETS TO ANY VALUE BETWEEN"
7 PRINT "0 (FREE FALL) AND 200 (MAXIMUM BURN) POUNDS PER SECOND"
8 PRINT "SET NEW BURN RATE EVERY 10 SECONDS."\PRINT
9 PRINT "CAPSULE WEIGHT 32,500 LBS;  FUEL WEIGHT 16,500 LBS"
10 PRINT\PRINT\PRINT "GOOD LUCK!!!"
11 L=0
13 PRINT\PRINT "SEC","MI + FT","MPH","LB FUEL","BURN RATE"\PRINT
15 A=120\V=1\M=33000\N=16500\G=1E-03\Z=1.8
21 PRINT L,INT(A);INT(5280*(A-INT(A))),3600*V,M-N,\INPUT K\T=10
31 IF M-N<.001 THEN 41\IF T<.001 THEN 21\S=T\IF M>=N+S*K THEN 35
32 S=(M-N)/K
35 GOSUB 91\IF I<=0 THEN 71\IF V<=0 THEN 38\IF J<0 THEN 81
38 GOSUB 61\GOTO 31
41 PRINT "FUEL OUT AT"L"SEC"\S=(-V+SQR(V*V+2*A*G))/G\V=V+G*S\L=L+S
51 W=3600*V\PRINT "ON MOON AT"L"SEC - IMPACT VELOCITY" W "MPH"
52 IF W>1.2 THEN 53\PRINT "PERFECT LANDING! (LUCKY)"\GOTO 95
53 IF W>10 THEN 56\PRINT "GOOD LANDING (COULD BE BETTER)"\GOTO 95
56 IF W>60 THEN 58 \PRINT "CRAFT DAMAGE.....YOU'RE STRANDED HERE UNTIL"
57 PRINT "A RESCUE PARTY ARRIVES.  HOPE YOU HAVE ENOUGH OXYGEN!"\GOTO 95
58 PRINT "SORRY, BUT THERE WERE NO SURVIVORS...YOU BLEW IT!"
59 PRINT "IN FACT, YOU BLASTED A NEW LUNAR CRATER"W*.227"FT DEEP"
60 GOTO 95
61 L=L+S\T=T-S\M=M-S*K\A=I\V=J\RETURN
71 IF S<5E-03 THEN 51\D=V+SQR(V*V+2*A*(G-Z*K/M))\S=2*A/D
73 GOSUB 91\GOSUB 61\GOTO 71
81 W=(1-M*G/(Z*K))/2\S=M*V/(Z*K*(W+SQR(W*W+V/Z)))+.05\GOSUB 91
83 IF I<=0 THEN 71\GOSUB 61\IF J>0 THEN 31\IF V>0 THEN 81\GOTO 31
91 Q=S*K/M\J=V+G*S+Z*(-Q-Q*Q/2-Q^3/3-Q^4/4-Q^5/5)
94 I=A-G*S*S/2-V*S+Z*S*(Q/2+Q^2/6+Q^3/12+Q^4/20+Q^5/30)\RETURN
95 PRINT\PRINT\PRINT\PRINT "TRY AGAIN??"\GOTO 6
99 END