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BASIC-like language interpreter for embedded systems
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Working program examples
Actual list of working tests from "NBS Minimal BASIC Test Programs - Version 2" with sources,
suitable to type in or load from SD card available at https://cloud.mail.ru/public/45SG/gGc2kFpBk
1. Neuton method for finding extremums of the 1 argument function
10 PRINT "FUNCTION EXTREMUMS FINDING"
20 REM FUNCTION F(X) IS COMPUTED AT LINE 3000
30 REM FIRST DERIVATIVE F'(X) IS COMPUTED AT LINE 1000
40 REM SECOND DERIVATIVE F''(X) IS COMPUTED AT LINE 2000
50 PRINT "PRECISION:":INPUT E
60 PRINT "INITIAL VALUE:":INPUT Z
70 PRINT "":PRINT "SEQUATIONAL APPROXYMATIONS":PRINT "X","Z"
80 LET X=Z
90 GOSUB 1000:GOSUB 2000
100 LET Z=X-F/D
110 PRINT X,Z
120 IF ABS(Z-X)>E GOTO 80
130 PRINT " "
140 LET X=Z:GOSUB 1000:GOSUB 2000:GOSUB 3000
150 IF D>0 THEN PRINT "MINIMUM:":GOTO 190
160 IF D<0 THEN PRINT "MAXIMUM:":GOTO 190
190 PRINT FF,"AT",X
200 END
1000 LET F=X-COS(X)
1010 RETURN
2000 LET D=1+SIN(X)
2010 RETURN
3000 LET FF=X^2/2-SIN(X)
3010 RETURN
2. Fibonacci method for finding unimodal function extremums
20 PRINT "FIBBONACCI SEARCH" : PRINT ""
30 REM PROGRAM TO SEARCH FOR INTERVAL(A,B)
40 REM CONTAINING MINIMUM POINT
50 REM OF UNIMODAL FUNCTION F(X) THROUGH
60 REM N COMPUTATION OF THE F(X)
100 DIM F (40)
110 PRINT "INPUT N" : INPUT N
120 F (0) = 0 : F (1) = 1
130 FOR I = 2 TO N
140 F (I) = F (I - 1) + F (I - 2)
150 NEXT I
160 PRINT "INPUT EPSILON" : INPUT E
200 PRINT "INPUT (A,B) INTERVAL"
210 INPUT A, B
250 X1 = A : X2 = A + ((B - A) * F(N - 1) + E * (-1)^N)/F(N) : X3 = B
260 X = X2 : GOSUB 1000 : F2 = Z
270 PRINT "CURRENT INTERVAL"
280 K = 1 : PRINT X1 , X3
290 X4 = X1 - X2 + X3
300 X = X4 : GOSUB 1000 : F4 = Z
310 IF F4 > F2 THEN GOTO 400
320 IF X2 < X4 THEN GOTO 360
330 X3 = X2 : X2 = X4 : F2 = F4 : PRINT X1 , X3
340 GOTO 500
360 X1 = X2 : X2 = X4 : F2 = F4 : PRINT X1 , X3
370 GOTO 500
400 IF X2 < X4 THEN GOTO 460
420 X1 = X4 : PRINT X1 , X3
430 GOTO 500
460 X3 = X4 : PRINT X1 , X3
500 K = K + 1
510 IF K <= N THEN GOTO 290
600 PRINT "FINAL INTERVAL" : PRINT X1, X3
610 PRINT "FUNCTION VALUE IS", F2
650 END
1000 Z = X^4 - 14*X^3 + 60*X^2 - 70*X
1010 RETURN
3. Classic TETRIS game
10 REM TETRIS MAIN PROGRAM, WRITTEN BY ANDREY SCVORTSOV, 2017
12 REM SOURCE IS IN PUBLIC DOMAIN
15 RANDOMIZE
20 SCREEN 1
25 CLS
30 W% = 10
35 H% = 20
40 DIM FIG@(6,3,3,3)
45 DIM SCR@(H%, W%+1)
50 FOR I%=0 TO H%-1
55 SCR@(I%, 0) = TRUE
60 SCR@(I%, W%+1) = TRUE
65 NEXT I%
70 FOR I%=1 TO W%
75 SCR@(H%, I%) = TRUE
80 NEXT I%
85 REM BOX
90 FIG@(0,0,1,1) = TRUE : FIG@(0,0,1,2) = TRUE
91 FIG@(0,0,2,1) = TRUE : FIG@(0,0,2,2) = TRUE
92 FIG@(0,1,1,1) = TRUE : FIG@(0,1,1,2) = TRUE
93 FIG@(0,1,2,1) = TRUE : FIG@(0,1,2,2) = TRUE
94 FIG@(0,2,1,1) = TRUE : FIG@(0,2,1,2) = TRUE
95 FIG@(0,2,2,1) = TRUE : FIG@(0,2,2,2) = TRUE
96 FIG@(0,3,1,1) = TRUE : FIG@(0,3,1,2) = TRUE
97 FIG@(0,3,2,1) = TRUE : FIG@(0,3,2,2) = TRUE
98 REM STICK
99 FIG@(1,0,2,0) = TRUE : FIG@(1,0,2,1) = TRUE
100 FIG@(1,0,2,2) = TRUE : FIG@(1,0,2,3) = TRUE
101 FIG@(1,1,0,1) = TRUE : FIG@(1,1,1,1) = TRUE
102 FIG@(1,1,2,1) = TRUE : FIG@(1,1,3,1) = TRUE
103 FIG@(1,2,2,0) = TRUE : FIG@(1,2,2,1) = TRUE
104 FIG@(1,2,2,2) = TRUE : FIG@(1,2,2,3) = TRUE
105 FIG@(1,3,0,1) = TRUE : FIG@(1,3,1,1) = TRUE
106 FIG@(1,3,2,1) = TRUE : FIG@(1,3,3,1) = TRUE
107 REM ZORB
108 FIG@(2,0,1,1) = TRUE : FIG@(2,0,2,0) = TRUE
109 FIG@(2,0,2,1) = TRUE : FIG@(2,0,2,2) = TRUE
110 FIG@(2,1,0,1) = TRUE : FIG@(2,1,1,1) = TRUE
111 FIG@(2,1,2,1) = TRUE : FIG@(2,1,1,2) = TRUE
112 FIG@(2,2,2,1) = TRUE : FIG@(2,2,1,0) = TRUE
113 FIG@(2,2,1,1) = TRUE : FIG@(2,2,1,2) = TRUE
114 FIG@(2,3,0,1) = TRUE : FIG@(2,3,1,1) = TRUE
115 FIG@(2,3,2,1) = TRUE : FIG@(2,3,1,0) = TRUE
116 REM F
117 FIG@(3,0,0,1) = TRUE : FIG@(3,0,1,1) = TRUE
118 FIG@(3,0,2,1) = TRUE : FIG@(3,0,0,2) = TRUE
119 FIG@(3,1,1,0) = TRUE : FIG@(3,1,1,1) = TRUE
120 FIG@(3,1,1,2) = TRUE : FIG@(3,1,2,2) = TRUE
121 FIG@(3,2,0,2) = TRUE : FIG@(3,2,1,2) = TRUE
122 FIG@(3,2,2,2) = TRUE : FIG@(3,2,2,1) = TRUE
123 FIG@(3,3,0,1) = TRUE : FIG@(3,3,1,1) = TRUE
124 FIG@(3,3,1,2) = TRUE : FIG@(3,3,1,3) = TRUE
125 REM 7
126 FIG@(4,0,0,1) = TRUE : FIG@(4,0,0,2) = TRUE
127 FIG@(4,0,1,2) = TRUE : FIG@(4,0,2,2) = TRUE
128 FIG@(4,1,1,3) = TRUE : FIG@(4,1,2,1) = TRUE
129 FIG@(4,1,2,2) = TRUE : FIG@(4,1,2,3) = TRUE
130 FIG@(4,2,0,1) = TRUE : FIG@(4,2,1,1) = TRUE
131 FIG@(4,2,2,1) = TRUE : FIG@(4,2,2,2) = TRUE
132 FIG@(4,3,1,1) = TRUE : FIG@(4,3,1,2) = TRUE
133 FIG@(4,3,1,3) = TRUE : FIG@(4,3,2,1) = TRUE
134 REM S
135 FIG@(5,0,0,2) = TRUE : FIG@(5,0,1,1) = TRUE
136 FIG@(5,0,1,2) = TRUE : FIG@(5,0,2,1) = TRUE
137 FIG@(5,1,1,1) = TRUE : FIG@(5,1,1,2) = TRUE
138 FIG@(5,1,2,2) = TRUE : FIG@(5,1,2,3) = TRUE
139 FIG@(5,2,0,2) = TRUE : FIG@(5,2,1,1) = TRUE
140 FIG@(5,2,1,2) = TRUE : FIG@(5,2,2,1) = TRUE
141 FIG@(5,3,1,1) = TRUE : FIG@(5,3,1,2) = TRUE
142 FIG@(5,3,2,2) = TRUE : FIG@(5,3,2,3) = TRUE
143 REM G
144 FIG@(6,0,0,1) = TRUE : FIG@(6,0,1,1) = TRUE
145 FIG@(6,0,1,2) = TRUE : FIG@(6,0,2,2) = TRUE
146 FIG@(6,1,1,2) = TRUE : FIG@(6,1,1,3) = TRUE
147 FIG@(6,1,2,1) = TRUE : FIG@(6,1,2,2) = TRUE
148 FIG@(6,2,0,1) = TRUE : FIG@(6,2,1,1) = TRUE
149 FIG@(6,2,1,2) = TRUE : FIG@(6,2,2,2) = TRUE
150 FIG@(6,3,1,2) = TRUE : FIG@(6,3,1,3) = TRUE
151 FIG@(6,3,2,1) = TRUE : FIG@(6,3,2,2) = TRUE
152 CYC = 0 : REM NEXT GAME STEP TIME
153 PRD = 1
154 SP% = 8
155 RES@=FALSE
156 CFG% = 0 : REM CURRENT ACTIVE FIGURE
158 CT = 0 : REM CURRENT TIME
170 CFX% = 0
172 CFY%=-2
174 X% = 0
176 Y% = 0
178 SC% = 0
180 MV% = 0
185 STG% = 0
190 CFP% = 0
192 GOSUB 10000
193 GOSUB 5000
194 GOSUB 3000
195 REM MAIN LOOP
200 CT = TIME()
205 IF CT < CYC THEN GOTO 225
210 CYC = CT+PRD-STG%/3000
215 STG% = STG%+1
220 GOSUB 1000
225 K$ = INKEY$()
230 IF K$ = "q" THEN GOTO 30000
235 IF K$ = "a" THEN MV% = -1 : GOSUB 2000
240 IF K$ = "d" THEN MV% = 1 : GOSUB 2000
245 IF K$ = "s" THEN GOSUB 1000
250 IF K$ = "w" THEN GOSUB 9000
990 GOTO 195
1000 REM GAME STEP SUBPROGRAM
1005 X% = CFX%
1010 Y% = CFY%+1
1015 GOSUB 6000
1020 IF RES@ THEN GOTO 1055
1025 RES@ = FALSE
1030 GOSUB 4000
1035 CFY% = Y%
1040 RES@ = TRUE
1045 GOSUB 4000
1050 RETURN
1055 IF CFY% < 1 THEN GOTO 30000
1056 SC% = SC%+1
1057 GOSUB 3000
1060 FOR I%=0 TO 3
1065 FOR J% = 0 TO 3
1070 IF CFY%+J% < 0 THEN GOTO 1085
1075 IF FIG@(CFG%, CFP%, J%, I%) = FALSE THEN GOTO 1085
1080 SCR@(CFY%+J%, CFX%+I%+1) = TRUE
1085 NEXT J%
1090 NEXT I%
1095 GOSUB 7000
1100 GOSUB 5000
1105 CFX% = 0
1110 CFY% = -2
1115 CFG% = RND() * 7
1990 RETURN
2000 REM MOVE FIGURE SUBPROGRAM
2005 X% = CFX%+MV%
2010 Y% = CFY%
2015 GOSUB 6000
2020 IF RES@ THEN GOTO 2990
2025 RES@ = FALSE
2030 GOSUB 4000
2035 CFX% = X%
2040 RES@ = TRUE
2045 GOSUB 4000
2990 RETURN
3000 REM PRINT SCORES SUBPROGRAM
3005 COLOR 1,0
3015 LOCATE 4,18
3020 PRINT SC%
3990 RETURN
4000 REM DRAW FIGURE SUBPROGRAM
4005 IF RES@ THEN COLOR 0,1 : GOTO 4015
4010 COLOR 1,0
4015 FOR I%=0 TO 3
4020 FOR J%=0 TO 3
4025 IF CFY%+J% < 0 THEN GOTO 4040
4030 IF FIG@(CFG%, CFP%, J%, I%) = FALSE THEN GOTO 4040
4035 BOX (SP%+(CFX%+I%)*SP%),(CFY%+J%)*SP%,SP%,SP%
4040 NEXT J%
4045 NEXT I%
4990 RETURN
5000 REM DRAW FIELD SUBPROGRAM
5025 COLOR 0,0
5030 BOX (SP%), 0, W%*SP%, H%*SP%
5035 COLOR 1, 0
5040 FOR I%=0 TO H%-1
5045 LINE (SP%), I%*SP%, (W%+1)*SP%, I%*SP%
5050 NEXT I%
5055 FOR I%=1 TO W%+1
5060 LINE (I%*SP%), 0, I%*SP%, H%*SP%
5065 NEXT I%
5070 COLOR 0,1
5075 FOR I%=1 TO W%
5080 FOR J% = 0 TO H%-1
5085 IF SCR@(J%, I%) = FALSE THEN GOTO 5095
5090 BOX (I%*SP%), J%*SP%, SP%, SP%
5095 NEXT J%
5100 NEXT I%
5990 RETURN
6000 REM TEST MOVE SUBPROGRAM
6005 RES@ = FALSE
6010 FOR I%=0 TO 3
6015 FOR J% = 0 TO 3
6020 IF X%+I%+1 < 0 THEN GOTO 6050
6025 IF Y%+J% < 0 THEN GOTO 6045
6030 IF FIG@(CFG%, CFP%, J%, I%) = FALSE THEN GOTO 6045
6035 IF SCR@(Y%+J%, X%+I%+1) = FALSE THEN GOTO 6045
6040 RES@ = TRUE
6045 NEXT J%
6050 NEXT I%
6990 RETURN
7000 REM TEST ROWS SUBPROGRAM
7005 DL@ = FALSE
7010 FOR I% = H%-1 TO 1 STEP -1
7015 RES@ = TRUE
7020 FOR J% = 1 TO W%
7025 IF SCR@(I%, J%) = FALSE THEN RES@ = FALSE
7030 NEXT J%
7035 IF RES@ THEN DL@ = TRUE : Y% = I% : GOSUB 8000
7040 NEXT I%
7045 IF DL@ THEN GOTO 7005
7990 RETURN
8000 REM DELETE ROW SUBPROGRAM
8005 FOR K% = 1 TO W%
8010 SCR@(Y%,K%) = FALSE
8015 NEXT K%
8020 GOSUB 5000
8030 DELAY 300
8035 FOR K% = Y% TO 1 STEP -1
8040 FOR L% = 1 TO W%
8045 SCR@(K%,L%) = SCR@(K%-1, L%)
8050 NEXT L%
8055 NEXT K%
8060 FOR K% = 1 TO W%
8065 SCR@(0,K%) = FALSE
8070 NEXT K%
8075 GOSUB 5000
8080 DELAY 300
8085 SC% = SC%+10
8090 GOSUB 3000
8990 RETURN
9000 REM ROTATE SUBPROGRAM
9005 T% = CFP%
9010 CFP% = CFP%+1
9015 IF CFP% > 3 THEN CFP% = 0
9020 X%=CFX%
9025 Y%=CFY%
9030 GOSUB 6000
9035 IF RES@ THEN CFP% = T% : GOTO 9990
9040 T1% = CFP%
9045 CFP% = T%
9050 RES@ = FALSE
9055 GOSUB 4000
9060 CFP% = T1%
9065 RES@ = TRUE
9070 GOSUB 4000
9990 RETURN
10000 REM STATIC BACKGROUND SUBPROGRAM
10005 COLOR 1,0
10010 BOX 100,18,40,15
10015 COLOR 1,1
10020 BOX 0,0,SP%,(H%+1)*SP%
10025 BOX (W%+1)*SP%,0,SP%,(H%+1)*SP%
10030 BOX (SP%), H%*SP%, W%*SP%, SP%
10035 LOCATE 2,18
10040 PRINT "POINTS"
10045 LOCATE 7,20
10050 PRINT "TERMINAL-BASIC"
10055 LOCATE 9,21
10060 PRINT "TETRIS V 1.0"
10990 RETURN
30000 REM EXIT TO BASIC SHELL
30005 SCREEN 0
30010 PRINT "YOU'V GOT";SC%;"POINTS"
30015 END
or size optimized variant
15 RANDOMIZE : SCREEN 1 : CLS : W% = 10 : H% = 20
40 DIM FIG@(6,3,3,3), SCR@(H%, W%+1)
50 FOR I%=0 TO H%-1 : SCR@(I%, 0) = TRUE :
60 SCR@(I%, W%+1) = TRUE : NEXT I%
70 FOR I%=1 TO W% : SCR@(H%, I%) = TRUE : NEXT I%
90 FIG@(0,0,1,1) = TRUE : FIG@(0,0,1,2) = TRUE
91 FIG@(0,0,2,1) = TRUE : FIG@(0,0,2,2) = TRUE
92 FIG@(0,1,1,1) = TRUE : FIG@(0,1,1,2) = TRUE
93 FIG@(0,1,2,1) = TRUE : FIG@(0,1,2,2) = TRUE
94 FIG@(0,2,1,1) = TRUE : FIG@(0,2,1,2) = TRUE
95 FIG@(0,2,2,1) = TRUE : FIG@(0,2,2,2) = TRUE
96 FIG@(0,3,1,1) = TRUE : FIG@(0,3,1,2) = TRUE
97 FIG@(0,3,2,1) = TRUE : FIG@(0,3,2,2) = TRUE
99 FIG@(1,0,2,0) = TRUE : FIG@(1,0,2,1) = TRUE
100 FIG@(1,0,2,2) = TRUE : FIG@(1,0,2,3) = TRUE
101 FIG@(1,1,0,1) = TRUE : FIG@(1,1,1,1) = TRUE
102 FIG@(1,1,2,1) = TRUE : FIG@(1,1,3,1) = TRUE
103 FIG@(1,2,2,0) = TRUE : FIG@(1,2,2,1) = TRUE
104 FIG@(1,2,2,2) = TRUE : FIG@(1,2,2,3) = TRUE
105 FIG@(1,3,0,1) = TRUE : FIG@(1,3,1,1) = TRUE
106 FIG@(1,3,2,1) = TRUE : FIG@(1,3,3,1) = TRUE
108 FIG@(2,0,1,1) = TRUE : FIG@(2,0,2,0) = TRUE
109 FIG@(2,0,2,1) = TRUE : FIG@(2,0,2,2) = TRUE
110 FIG@(2,1,0,1) = TRUE : FIG@(2,1,1,1) = TRUE
111 FIG@(2,1,2,1) = TRUE : FIG@(2,1,1,2) = TRUE
112 FIG@(2,2,2,1) = TRUE : FIG@(2,2,1,0) = TRUE
113 FIG@(2,2,1,1) = TRUE : FIG@(2,2,1,2) = TRUE
114 FIG@(2,3,0,1) = TRUE : FIG@(2,3,1,1) = TRUE
115 FIG@(2,3,2,1) = TRUE : FIG@(2,3,1,0) = TRUE
117 FIG@(3,0,0,1) = TRUE : FIG@(3,0,1,1) = TRUE
118 FIG@(3,0,2,1) = TRUE : FIG@(3,0,0,2) = TRUE
119 FIG@(3,1,1,0) = TRUE : FIG@(3,1,1,1) = TRUE
120 FIG@(3,1,1,2) = TRUE : FIG@(3,1,2,2) = TRUE
121 FIG@(3,2,0,2) = TRUE : FIG@(3,2,1,2) = TRUE
122 FIG@(3,2,2,2) = TRUE : FIG@(3,2,2,1) = TRUE
123 FIG@(3,3,0,1) = TRUE : FIG@(3,3,1,1) = TRUE
124 FIG@(3,3,1,2) = TRUE : FIG@(3,3,1,3) = TRUE
126 FIG@(4,0,0,1) = TRUE : FIG@(4,0,0,2) = TRUE
127 FIG@(4,0,1,2) = TRUE : FIG@(4,0,2,2) = TRUE
128 FIG@(4,1,1,3) = TRUE : FIG@(4,1,2,1) = TRUE
129 FIG@(4,1,2,2) = TRUE : FIG@(4,1,2,3) = TRUE
130 FIG@(4,2,0,1) = TRUE : FIG@(4,2,1,1) = TRUE
131 FIG@(4,2,2,1) = TRUE : FIG@(4,2,2,2) = TRUE
132 FIG@(4,3,1,1) = TRUE : FIG@(4,3,1,2) = TRUE
133 FIG@(4,3,1,3) = TRUE : FIG@(4,3,2,1) = TRUE
135 FIG@(5,0,0,2) = TRUE : FIG@(5,0,1,1) = TRUE
136 FIG@(5,0,1,2) = TRUE : FIG@(5,0,2,1) = TRUE
137 FIG@(5,1,1,1) = TRUE : FIG@(5,1,1,2) = TRUE
138 FIG@(5,1,2,2) = TRUE : FIG@(5,1,2,3) = TRUE
139 FIG@(5,2,0,2) = TRUE : FIG@(5,2,1,1) = TRUE
140 FIG@(5,2,1,2) = TRUE : FIG@(5,2,2,1) = TRUE
141 FIG@(5,3,1,1) = TRUE : FIG@(5,3,1,2) = TRUE
142 FIG@(5,3,2,2) = TRUE : FIG@(5,3,2,3) = TRUE
144 FIG@(6,0,0,1) = TRUE : FIG@(6,0,1,1) = TRUE
145 FIG@(6,0,1,2) = TRUE : FIG@(6,0,2,2) = TRUE
146 FIG@(6,1,1,2) = TRUE : FIG@(6,1,1,3) = TRUE
147 FIG@(6,1,2,1) = TRUE : FIG@(6,1,2,2) = TRUE
148 FIG@(6,2,0,1) = TRUE : FIG@(6,2,1,1) = TRUE
149 FIG@(6,2,1,2) = TRUE : FIG@(6,2,2,2) = TRUE
150 FIG@(6,3,1,2) = TRUE : FIG@(6,3,1,3) = TRUE
151 FIG@(6,3,2,1) = TRUE : FIG@(6,3,2,2) = TRUE
152 PRD = 1 : SP% = 8 : RES@=FALSE : CFY%=-2
192 GOSUB 10000 : GOSUB 5000 : GOSUB 3000
195 REM
200 CT = TIME() : IF CT < CYC THEN GOTO 225
210 CYC = CT+PRD-STG%/3000 : STG% = STG%+1 : GOSUB 1000
225 K$ = INKEY$() : IF K$ = "q" THEN GOTO 30000
235 IF K$ = "a" THEN MV% = -1 : GOSUB 2000
240 IF K$ = "d" THEN MV% = 1 : GOSUB 2000
245 IF K$ = "s" THEN GOSUB 1000
250 IF K$ = "w" THEN GOSUB 9000
990 GOTO 195
1000 REM
1005 X% = CFX% : Y% = CFY%+1 : GOSUB 6000
1020 IF RES@ THEN GOTO 1055
1025 RES@ = FALSE : GOSUB 4000 : CFY% = Y% : RES@ = TRUE : GOSUB 4000
1050 RETURN
1055 IF CFY% < 1 THEN GOTO 30000
1056 SC% = SC%+1 : GOSUB 3000
1060 FOR I%=0 TO 3 : FOR J% = 0 TO 3 : IF CFY%+J% < 0 THEN GOTO 1085
1075 IF FIG@(CFG%, CFP%, J%, I%) = FALSE THEN GOTO 1085
1080 SCR@(CFY%+J%, CFX%+I%+1) = TRUE
1085 NEXT J% : NEXT I%
1095 GOSUB 7000 : GOSUB 5000 : CFX% = 0 : CFY% = -2 : CFG% = RND() * 7
1990 RETURN
2000 REM
2005 X% = CFX%+MV% : Y% = CFY% : GOSUB 6000 : IF RES@ THEN GOTO 2990
2025 RES@ = FALSE : GOSUB 4000 : CFX% = X% : RES@ = TRUE : GOSUB 4000
2990 RETURN
3000 REM
3005 COLOR 1,0 : LOCATE 4,18 : PRINT SC%
3990 RETURN
4000 REM
4005 IF RES@ THEN COLOR 0,1 : GOTO 4015
4010 COLOR 1,0
4015 FOR I%=0 TO 3 : FOR J%=0 TO 3
4025 IF CFY%+J% < 0 THEN GOTO 4040
4030 IF FIG@(CFG%, CFP%, J%, I%) = FALSE THEN GOTO 4040
4035 BOX (SP%+(CFX%+I%)*SP%),(CFY%+J%)*SP%,SP%,SP%
4040 NEXT J% : NEXT I%
4990 RETURN
5000 REM
5025 COLOR 0,0 : BOX (SP%), 0, W%*SP%, H%*SP% : COLOR 1, 0
5040 FOR I%=0 TO H%-1
5045 LINE (SP%), I%*SP%, (W%+1)*SP%, I%*SP%
5050 NEXT I% : FOR I%=1 TO W%+1
5060 LINE (I%*SP%), 0, I%*SP%, H%*SP%
5065 NEXT I% : COLOR 0,1 : FOR I%=1 TO W% : FOR J% = 0 TO H%-1
5085 IF SCR@(J%, I%) = FALSE THEN GOTO 5095
5090 BOX (I%*SP%), J%*SP%, SP%, SP%
5095 NEXT J% : NEXT I%
5990 RETURN
6000 REM
6005 RES@ = FALSE : FOR I%=0 TO 3 : FOR J% = 0 TO 3
6020 IF X%+I%+1 < 0 THEN GOTO 6045
6025 IF Y%+J% < 0 THEN GOTO 6045
6030 IF FIG@(CFG%, CFP%, J%, I%) = FALSE THEN GOTO 6045
6035 IF SCR@(Y%+J%, X%+I%+1) = FALSE THEN GOTO 6045
6040 RES@ = TRUE
6045 NEXT J% : NEXT I%
6990 RETURN
7000 REM
7005 DL@ = FALSE : FOR I% = H%-1 TO 1 STEP -1 : RES@ = TRUE
7020 FOR J% = 1 TO W% : IF SCR@(I%, J%) = FALSE THEN RES@ = FALSE
7030 NEXT J% : IF RES@ THEN DL@ = TRUE : Y% = I% : GOSUB 8000
7035 NEXT I%
7040 IF DL@ THEN GOTO 7005
7990 RETURN
8000 REM
8005 FOR K% = 1 TO W% : SCR@(Y%,K%) = FALSE : NEXT K%
8020 GOSUB 5000 : DELAY 300
8035 FOR K% = Y% TO 1 STEP -1 : FOR L% = 1 TO W%
8045 SCR@(K%,L%) = SCR@(K%-1, L%) : NEXT L% : NEXT K%
8060 FOR K% = 1 TO W% : SCR@(0,K%) = FALSE : NEXT K%
8075 GOSUB 5000 : DELAY 300 : SC% = SC%+10 : GOSUB 3000
8990 RETURN
9000 REM
9005 T% = CFP% : CFP% = CFP%+1 : IF CFP% > 3 THEN CFP% = 0
9020 X%=CFX% : Y%=CFY% : GOSUB 6000
9035 IF RES@ THEN CFP% = T% : GOTO 9990
9040 T1% = CFP% : CFP% = T% : RES@ = FALSE : GOSUB 4000
9060 CFP% = T1% : RES@ = TRUE : GOSUB 4000
9990 RETURN
10000 REM
10005 COLOR 1,0 : BOX 100,18,40,15 : COLOR 1,1
10020 BOX 0,0,SP%,(H%+1)*SP%
10025 BOX (W%+1)*SP%,0,SP%,(H%+1)*SP%
10030 BOX (SP%), H%*SP%, W%*SP%, SP%
10035 LOCATE 2,18 : PRINT "POINTS"
10045 LOCATE 7,20 : PRINT "TERMINAL-BASIC"
10055 LOCATE 9,21 : PRINT "TETRIS V 1.0"
10990 RETURN
30000 REM
30005 SCREEN 0 : PRINT "YOU'V GOT";SC%;"POINTS"
30010 END
