by david
28. February 2011 20:15
Now that I have a C compiler for the PDP-11, I decided to do something interesting with it. Drawing a fractal seemed to fit the bill, so I did a google search to see if anybody had managed to render the Mandelbrot Set in ASCII Art. I found this Java code. So I decided that I should port it to K&R C and see if it runs on the PDP-11. This is the result:
Very not bad! And if you're interested, the K&R version came out like this:
#include <stdio.h>
/* CC
mandel.c/A
link mandel.obj,c:suport.obj,c:clib.obj
*/
main()
{
float b,e,r,n,d;
int h,c;
for(e=1.1; e>-1.2; e-=.1)
{
for(b=-2; b<1; b+=.04)
{
if ((++c % 76)==0) printf("\r\n");
else printf("%c",h);
n=0;
h=127;
for(r=0; r*r+n*n<4 && --h>32; d=r)
{
r = r*r-n*n+b;
n = 2*d*n+e;
}
}
}
}
So far this has only been done in SIMH, but when I have made a physical 5.25" boot disk I will try it on the real machine. I'm interested to know how fast (or slow) it is...
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