RosettaCodeData/Task/Julia-set/ZX-Spectrum-Basic/julia-set.basic

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10 LET creal=-0.8
20 LET cimag=0.156
30 FOR v=-16 TO 16
40 FOR h=-64 TO 64
50 LET x=h/40
60 LET y=v/20
70 FOR i=1 TO 50
80 LET zreal=x*x-y*y+creal
90 LET zimag=x*y*2+cimag
100 IF zreal*zreal>1000 THEN GO TO 150
110 LET x=zreal
120 LET y=zimag
130 NEXT i
140 PLOT h+100,150-v
150 NEXT h
160 NEXT v