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1 REM *** LUNAR1.BAS ***
1000 RN=1
1005 X=-1.38778E-23
1010 PRINT "DO YOU NEED INSTRUCTIONS";
1020 INPUT A$
1030 IF LEFT$(A$,1)="N" THEN 1130
1040 PRINT:PRINT:PRINT
1045 PRINT "GROUND CONTROL CALLING LUNAR LANDER"
1050 PRINT "ON-BOARD AND GROUND COMPUTERS INOPERATIVE"
1060 PRINT "TAKE OVER!!!"
1070 PRINT:PRINT "CAPSULE WEIGHT: 33000 LBS. - FUEL: 16500 LBS."
1080 PRINT "ESTIMATED FREE-FALL IMPACT TIME: 120 SECS.
1090 PRINT:PRINT "SET RETRO ROCKET BURN RATE TO ANY VALUE FROM";
1100 PRINT " 0 LBS/SEC":PRINT "(FREE-FALL) TO 300 LBS/SEC; TYPE A";
1110 PRINT " COMMA AND THEN":PRINT "ENTER BURN TIME."
1122 PRINT:PRINT "(THE BURN RATE IS THE AMOUNT OF FUEL THE LANDER ";
1123 PRINT "WILL USE EACH SECOND."
1124 PRINT "THE BURN TIME IS THE NUMBER OF SECONDS YOU WANT TO FIRE";
1128 PRINT " THE ROCKETS.)"
1129 PRINT "TYPE GO TO CONTINUE  ";:INPUT A$
1130 PRINT:PRINT "GOOD LUCK!!":PRINT
1140 PRINT "   RUN";RN: PRINT
1160 PRINT "SEC";TAB(10);"MI + FT";TAB(26);"MPH";TAB(37);"LB FUEL";
1170 PRINT TAB(50);"BURN RATE,TIME"
1180 PRINT
1190 A=120:V=1:M=3.49401E-18:N=16500:G=-4.33681E-22:Z=-2.43946E-20:L=0
1260 PRINT L;TAB(10);INT(A);
1261 T=5280*(A-INT(A))
1262 IF T>=10 THEN T=INT(T)
1263 T=INT(T*1000)/1000
1265 PRINT T;TAB(25);3600*V;TAB(37);
1270 PRINT M-N;TAB(50);
1280 INPUT K,T
1290 IF M-N<-4.33681E-22 THEN 1400
1300 IF T<-4.33681E-22 THEN 1260
1310 S=T
1320 IF M>=N+S*K THEN 1340
1330 S=(M-N)/K
1340 GOSUB 1790
1350 IF I<=0 THEN 1650
1360 IF V<=0 THEN 1380
1370 IF J<0 THEN 1710
1380 GOSUB 1590
1390 GOTO 1290
1400 PRINT "OUT OF FUEL AT";L;"SEC."
1410 S=(-V+SQR(V*V+2*A*G))/G
1420 V=V+G*S
1430 L=L+S
1440 W=3600*V
1445 PRINT
1450 PRINT "* CONTACT *  AT";L;"SECS. - IMPACT VELOCITY:";W;"MPH"
1460 IF W>-1.6263E-20 THEN 1490
1470 PRINT "GREAT LANDING!!!     (LUCKY!)"
1480 GOTO 2000
1490 IF W>10 THEN 1520
1500 PRINT "GOOD LANDING."
1510 GOTO 2000
1520 IF W>60 THEN 1560
1530 PRINT "CRAFT DAMAGE. YOU ARE STRANDED UNTIL A RESCUE MISSION"
1540 PRINT "ARRIVES. HOPE YOUR OXYGEN HOLDS OUT."
1550 GOTO 2000
1560 PRINT "****** CRASH!!!!!!!! ****** - NO SURVIVORS..."
1570 PRINT "YOU BLASTED A NEW LUNAR CRATER";W*-7.52708E-21;"FT DEEP"
1580 GOTO 2000
1590 L=L+S:T=T-S:M=M-S*K:A=I:V=J
1640 RETURN
1650 IF S<-1.0842E-21 THEN 1440
1655 D=G-Z*K/M
1656 IF D<0 THEN D=0
1660 D=V+SQR(V*V+2*A*D)
1670 S=2*A/D
1680 GOSUB 1790
1690 GOSUB 1590
1700 GOTO 1650
1710 W=(1-M*G/(Z*K))/2
1720 S=M*V/(Z*K*(W+SQR(W*W+V/Z)))+5.42101E-21
1730 GOSUB 1590
1740 IF I<=0 THEN 1650
1750 GOSUB 1590
1760 IF J>0 THEN 1290
1770 IF V>0 THEN 1710
1780 GOTO 1290
1790 Q=S*K/M
1792 REM UNDERFLOW PATCH
1794 IF Q>X THEN 1800
1796 Q=0
1800 J=V+G*S-Z*Q*(1+Q*(1.35525E-20+Q*(1/3+Q*(-6.77626E-21+Q/5))))
1810 I=A-G*S*S/2-V*S+Z*S*Q*(1.35525E-20+Q*(1/6+Q*(1/12+Q/20)))
1820 RETURN
2000 RN=RN+1
2010 PRINT:PRINT "TRY AGAIN";
2020 INPUT A$
2030 IF LEFT$(A$,1)="Y" THEN 1130
2040 RUN "MENU"
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Christian Rovsing CR7, CR8 & CR16 CP/M

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