I have spent the last couple weeks working on breadboarding the CPU for the motor deck , still working a few problems. I also started work on my robotics web page, Its not complete but if anybody is looking for a 6808 cross compiler and manual, I put one on the website. I'm hoping to get some pictures for the projects posted soon. I really need to get a digital camera, would simplify this process significantly.
I started sections for three projects on my web site, "6808 Bench unit", "DMC Display" and "Turtle." The "6808 Bench unit" is what I use to build and test peripheral projects that will connect to a 6808 based project. The OS in the Bench Unit makes trouble shooting the circuit and driver software fairly easy. The "DMC Display" project is a generic interface circuit to connect a Dot Matrix Character LCD Display to a micro processor. I've used these displays on serveral projects. "Turtle" is the name I've given to the motor deck portion of the robot I'm working on. I chose the name turtle because the interface language will be base on the "turtle logo" concept. The control deck will issue "logo" type commands to the motor deck. My web site will have enough detail about each project that anyone wishing to duplicate on of these projects should be able to find enough detail to do so.
I found a company up in Boulder Co. that sells sonar units. They have a full kit that will do 6" to 35 feet for about $40. I'm thinking about picking up one of these. http://www.acroname.com The part number is R14-sonar1.