The AgVision terminal was also sold through Radio Shack stores as the VideoTex terminal around 1980.
By that time in late 1979, the new and powerful Motorola MC6809 processor was released and, together, the SAM, VDG, and 6809 are combined. Motorola solved this problem by integrating all the functions of the many smaller chips into one chip, the MC6883 Synchronous Address Multiplexer (SAM). Unfortunately the prototype contained too many chips to be commercially viable. At the core of the prototype 'Green Thumb' terminal, the MC6847, along with the MC6808 Microprocessor Unit (MPU), made the prototype a reality by about 1978. Motorola's MC6847 Video Display Generator (VDG) chip was released about the same time as the joint venture started and it has been speculated that the VDG was actually designed for this project. This terminal would connect to a phone line and an ordinary color TV and allow the user access to near real-time information useful to their day to day operations on the farm. The initial goal of this project, called 'Green Thumb', was to create a low cost VideoTex terminal for farmers, ranchers, and others in the agricultural industry. to develop a low cost home computer in 1977. The TRS-80 Color Computer, often referred to as CoCo by its users, started out as a joint venture between Fort Worth based Tandy Corporation and (then) Austin based Motorola Semiconductor, Inc.
