I worked hard for 6 mounth and write new program for eq4/eq5 telescope hand controller,I replace 87c51 with 89s52 and controller working very fine.If you want to get source code please leave private message for me .This is circuit of eq5 dual axis motor drive hand controller from pcb.
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http://www.ir-micro.com/modules.php?...ewtopic&t=2433