I think 8051 + step Motor maybe can use for GOTO system
and some telescope controller also can receiver PC RS232 command
have anyone know telescope control command like skyMap /starryNight Pro
quide star can not , guide star need CCD camera for focus .
You could try here **broken link removed**
An old design using a 6809, but there might be something useful there.
there is also www.bbastrodesigns.com
This uses a PC & stepper motors.
I have seen other microcontroller based designs in the past but can't find them now.
For control software there is HNSKY or Cartes du Ciel both of which use ASCOM plug for LX200 commands.