Dave i remember all those threads.
Uspl, Scope II is has to be purchased, and i am not sure it will work as it is written for controlling the Servo systems.
If your doing it low budget then i would look ad the Roboscope yahoo groups. They are using a Austostar 497 controller with motors from Meade DS mount or better yet the LXD mounts. This method is a very good one because you will have a proven and tested hand controller that just works and is easy to use.
If your looking for a simple tracking solution then you could possibly write your own Alt/Az tracking only application or perhaps borrow from Dave's code. This would be a good solution for simple point and track mode, and you could add some encoders and Davek's DSC system to give you a push to point and track system.
Another option is to consider a PIC or similar design with code for tracking only with some buttons to provide different tracking rates.
And here is another one you could look at
http://martin-cibulski.de/atm/mount_...er_4/index.php
Regards
Fahim