"G" column

10 FOR Y=-12 to 12
20 FOR X=-39 TO 39
30 CA=X*.0458
40 CB=Y*.08333
50 A=CA
60 B=CB
70 FOR I = 0 TO 15
80 T=A*A-B*B+CA
90 B=2*A*B+CB
100 A=T
110 IF(A*A+B*B)>4 GOTO 200
120 NEXT I
130 PRINT " ";
140 GOTO 210
200 IF I>9 THEN I=I+7
205 PRINT CHR$(48+I);
210 NEXT X
220 PRINT
230 NEXT Y