100 DIM A(480*S): A(480*S)=0
110 CLS: R=0: C=0
120 CC=PEEK(1024+K*32+C)
130 A$INKEY$: IF A$<>" THEN 160
140 IF K=0 THEN POKE 1024+R*32+C,128: K=1: GOTO 130
130 POKE 1024+R*32+C,255: K=0: GOTO 130
160 POKE 1024+R*32+C,CC:A=ASC(A$):
170 IF A=94 THEN 330
180 IF A=95 THEN 400
190 IF (A<32) OR (A>127) THEN 250
200 IF A=64 THEN POKE 1024+R*32+C,96; GOTO 270
210 IF (A>31) AND (A<65) THEN A=A+64
220 POKE 1024+R*32+C,A
230 C=C+1: IF C=32 THEN C=0: R=R+1: IF R=15 THEN R=0
240 GOTO 120
250 IF (A<8) OR (A>13) THEN 120
260 ON A-7 GOTO 270,290,310,120,120,350
270 C=C-1: IF C=-1 THEN C=31: R=R-1: IF R=-1 THEN R=14
280 GOTO 120
290 C=C+1: IF C=32 THEN C=0: R=R+1: IF R=15 THEN R=0
300 GOTO 120
310 R=R+1: IF R=15 THEN R=0
320 GOTO 120
330 R=R-1: IF R=-1 THEN R=14
340 GOTO 120
350 FOR J=1 TO 32-C
360 POKE 1024+R*32+C,223
370 C=C+1: NEXT J
380 R=R+1: C=0: IF R=15 THEN R=0
390 GOTO 120
400 PRINT@48O,"FUNCTION?";
410 A$=INKEY$: IF A$="" THEN 410
420 PRINT @490,A$;
430 IF A$="W" THEN 720
440 IF A$="L" THEN 810
450 IF A$="P" THEN 650
460 IF A$="S" THEN 560
470 IF A$<>"G" THEN 900
480 A$=INKEY$: IF A$="" THEN 480
490 PRINT @491,A$;:IF (A$<"1") OR (A$>"5") THEN 900
500 B=(VAL(A$)-1)*480
510 J=0
520 FOR I=B TO B+479
530 POKE 1024+J,A(I)
540 J=J+1: NEXT I
550 GOTO 900
560 A$=INKEY$: IF A$="" THEN 560
570 PRINT @491,A$;:IF (A$<"L") OR (A$>"5") THEN 900
580 B=(VAL(A$)-1)*480
590 J=0
600 FOR I=B TO B+479
610 A(I)=PEEK(1O24+J)
620 J=J+1: NEXT I
630 A(480*5)=I-1
640 GOTO 900
650 FOR I=0 TO A(480*S)
660 IF A(I)=223 THEN PRINT#-2: I=INT(I/32)*32+31: GOTO 690
670 B=A(I): IF B>90 THEN B=A(I)-64
680 PRINT#-2,CHR$(B);
690 A$=INKEY$: IF A$<>"" THEN 900
700 NEXT I
710 GOTO 900
720 REM CASSETTE OUTPUT
730 CLS
740 OPEN "O",-1,"SCREEN"
750 FOR I=0 TO 480*5
760 PRINT#-1,A(I)
770 PRINT".";
780 NEXT I
790 CLOSE-1
800 A$="1": GOTO 500
810 REM CASSETTE INPUT
820 CLS
830 OPEN "I",-1,"SCREEN"
840 FOR I=0 TO 480*5
850 INPUT#-1,A(I)
860 PRINT".";
870 NEXT I
880 CLOSE-1
890 A$="1": GOTO 500
900 PRINT @48O,"                    ";:GOTO 120