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120 PRINT"YOU HAVE THE OPPORTUNITY OF TRYING TO BEAT THE COMPUTER"
130 PRINT"AT TIC-TAC-TOE.  ENTER YOUR MOVES AS FOLLOWS:"
140 PRINT
150 DIM C(11)
160 DIM D(11)
170 FOR K=1 TO 11
180 READ C(K), D(K)
190 NEXT K
200 PRINT "...ROW NUMBER...COMMA...COLUMN NUMBER..."
210 PRINT
220 PRINT"ROWS ARE HORIZONTAL(ACROSS)...COLUMNS ARE VERTICAL(UP + DOWN)"
230 DIM B(9)
240 DIM A(3,3)
250 PRINT
260 PRINT "NEW GAME STARTED NOW..........................."
270 FOR J=1 TO 3
280 FOR I=1 TO 3
290 LET A(I,J)=0
300 NEXT I
301 LET I=I-1
310 NEXT J
311 LET J=J-1
320 LET Z= 0
330 PRINT "YOUR MOVE",
340 INPUT R,C
350 PRINT
360 IF R>3 THEN 620
370 IF C>3 THEN 620
380 IF A(R,C) <> 0 THEN 620
390 LET A(R,C)=-1
400 GOSUB 1660
410 IF Z =1 THEN 2070
420 REM MACHINE MOVE...
430 GOSUB 1100
440 REM TEST FOR GAME WIN...
450 GOSUB 1660
460 IF Z=0 THEN 650
470 REM PRINT GAME BOARD..
480 GO TO 490
490 PRINT
500 FOR K=1 TO 3
510 LET B=A(K,1)
520 LET D=A(K,2)
530 LET F=A(K,3)
540 GOSUB 840
550 IF K>2 THEN 570
560 PRINT "***************"
570 NEXT K
571 LET K=K-1
580 PRINT
590 IF Z <>0 THEN 2070
600 GO TO 330
610 STOP
620 PRINT "---- ILLEGAL MOVE -- TRY AGAIN ----"
630 PRINT
640 GO TO 330
650LET T2=0
660 FOR J=1 TO 3
670 FOR I=1 TO 3
680 IF A(I,J)<>0 THEN 700
690 LET T2=T2+1
700 NEXT I
701 LET I=I-1
710 NEXT J
711 LET J=J-1
720 IF  T2>0 THEN 750
730 GOSUB 1340
740 GO TO 480
750 IF T2>1 THEN 480
760 FOR J=1 TO 8
770 IF B(J)=-2 THEN 800
780 NEXT J
781 LET J=J-1
790 GO TO 730
800 GOSUB 2000
810 GO TO 480
820 REM PRINT TIC-TAC-TOE BOARD ROW.....
830 REM 
840 IF B<>0 THEN 910
850 PRINT "    * ";
860 IF D<>0 THEN 940
870 PRINT "    * ";
880 IF F<>0 THEN 970
890 PRINT "  "
900 GO TO 1070
910 IF B>0 THEN 1000
920 PRINT "YOU * ";
930 GO TO 860
940 IF D>0 THEN 1020
950 PRINT "YOU * ";
960 GO TO 880
970 IF F>0 THEN 1040
980 PRINT "YOU"
990 GO TO 900
1000 PRINT"PDP * ";
1010 GO TO 860
1020 PRINT "PDP * ";
1030 GO TO 880
1040 PRINT "PDP"
1050 GO TO900
1060 REM PRINT LEGENDS..
1070 PRINT "    *     * "
1080 RETURN
1090 REM PROGRAM TO MAKE MOVE FOR THE MACHINE....
1100 LET M=INT(3.33*RND(M))
1110 LET N=INT(3.33333*RND(N))
1120 IF M=0 THEN 1100
1130 IF M>3 THEN 1100
1140 IF N=0 THEN 1110
1150 IF N>3 THEN 1110
1160 LET C(2)=M
1170 LET D(2)=N
1180 LET C(3)=N
1190 LET D(3)=M
1200 FOR I=1 TO 8
1210 IF B(I)>1 THEN 1370
1220 NEXT I
1221 LET I=I-1
1230 FOR I=1 TO 8
1240 IF B(I)<-1 THEN 1370
1250 NEXT I
1251 LET I=I-1
1260 IF R+C=0 THEN 1550
1270 FOR K=1 TO 11
1280 LET I=C(K)
1290 LET J=D(K)
1300 IF A(I,J)<>0 THEN 1330
1310 LET A(I,J)=1
1320 GO TO 1360
1330 NEXT K
1331 LET K=K-1
1340 PRINT "  ... TIE GAME ...  "
1350 LET Z=3
1360 RETURN
1370 IF I>3 THEN 1440
1380 FOR J=1 TO 3
1390 IF A(I,J)=0 THEN 1420
1400 NEXT J
1401 LET J=J-1
1410 GO TO 1360
1420 LET A(I,J)=1
1430 GO TO 1360
1440 IF I>6 THEN 1510
1450 FOR J=1 TO 3
1460 IF A(J,I-3)=0 THEN 1490
1470 NEXT J
1471 LET J=J-1
1480 GO TO 1360
1490 LET A(J,I-3)=1
1500 GO TO 1360
1510 IF I>7 THEN 1550
1520 FOR J=1 TO 3
1530 IF A(J,J)=0 THEN 1590
1540 NEXT J
1541 LET J=J-1
1550 IF A(1,3)=0 THEN 1610
1560 IF A(3,1)=0 THEN 1630
1570 LET A(2,2)=1
1580 GO TO 1360
1590 LET A(J,J)=1
1600 GO TO 1360
1610 LET A(1,3)=1
1620 GO TO 1360
1630 LET A(3,1)=1
1640 GO TO 1360
1650 REM PROGRAM TO TEST FOR GAME WINNER....
1660 LET T1=0
1670 FOR J=1 TO 9
1680 LET B(J)=0
1690 NEXT J
1691 LET J=J-1
1700 FOR J=1 TO 3
1710 FOR I=1 TO 3
1720 IF A(J,1)<>A(J,I) THEN 1750
1730 NEXT I
1731 LET I=I-1
1740 LET T1=A(J,I)
1750 NEXT J
1751 LET J=J-1
1760 FOR J=1 TO 3
1770 FOR I=1 TO 3
1780 IF A(1,J)<>A(I,J) THEN 1810
1790 NEXT I
1791 LET I=I-1
1800 LET T1=A(I,J)
1810 NEXT J
1811 LET J=J-1
1820 IF A(1,1)=A(3,3) THEN 1930
1830 IF A(3,1)=A(1,3) THEN 1970
1840 IF T1<>0 THEN 1990
1850 FOR J=1 TO 3
1860 FOR I=1 TO 3
1870 LET B(J)=B(J)+A(J,I)
1880 LET B(J+3)=B(J+3)+A(I,J)
1890 NEXT I
1891 LET I=I-1
1900 NEXT J
1901 LET J=J-1
1910 LET B(7)=A(1,1)+A(2,2)+A(3,3)
1920 RETURN
1930 IF A(2,2)=A(3,3) THEN 1950
1940 GO TO 1830
1950 LET T1=A(2,2)
1960 GO TO 1840
1970 IF A(2,2)=A(1,3) THEN 1950
1980 GO TO 1840
1990 IF T1>0 THEN 2030
2000 PRINT " ...YOU WIN THIS TIME..."
2010 LET Z=1
2020 GO TO 1850
2030 PRINT " ... THE PDP-8 WINS THIS TIME ..."
2040 LET Z=2
2050 GO TO 1850
2060 REM END OF TEST WINNER PROGRAM.......
2070 PRINT "DO YOU WANT TO PLAY ANOTHER GAME: YES(1), NO(0)",
2080 INPUT X1
2090 IF X1 = 1 THEN 250
2100 IF X1 = 0 THEN 2130
2110 PRINT "I SAID ONE OR ZERO: TRY AGAIN",
2120 GO TO 2080
2130 PRINT"IT	S BEEN FUN, COME AGAIN SOMETIME"
2140 GO TO 2160
2150 DATA 2,2,0,0,0,0,1,1,3,3,1,3,3,1,1,2,3,2,2,3,2,1
2160 CHAIN "DEMON "
2170 END
 END
0,1,1,3,3,1,3,3,1,1,2,3,2,2,3,2,1
2160 CHAIN "DEMON "
2170 END
1,1,3,3,1,3,3,1,1,2,3,2,2,3,2,1
2160 CHAIN "DEMON "
2170 END
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