5 CLS:KEY OFF
10 INPUT A, B, C
15 PRINT "DONE"
20 N$="OUTPUT.DAT": GOSUB 1000
999 END
1000 ' dump screen
1010 DEF SEG=&HB800
1020 OPEN N$ FOR OUTPUT AS 1
1030 FOR Y = 0 TO 24
1040 FOR X = 0 TO 79
1050 PRINT #1, CHR$(PEEK(2*(Y*80+X)));
1060 NEXT
1065 PRINT #1, ""
1070 NEXT
1080 CLOSE 1
1090 RETURN

