The synscan principle is used with the celestron and Skywatchers. I imagine the controllers are similar but I don't know the details of the interface to the motors.
I imagine it is some form of microstep generation via a stepper motor controller chip. I would expect that a Picaxe controller could be made to duplicate all the functions you require.
If you make your interface respond to LX200 commands you won't even need the ASCOM interface as all the programs I know of have a LX200 connection.
Barry
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