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Within a few months, Radio Shack stores across the US and Canada began receiving and selling the new computer. The initial model (catalog number 26-3001) shipped with 4K of Dynamic Random Access Memory (DRAM) and an 8k Microsoft BASIC interpreter in ROM. Sharing the same case, keyboard, and layout as the AgVision/VideoTex terminals, at first glance it would be hard to tell the TRS-80 Color Computer from its predecessors. On July 31, 1980, Tandy announced the TRS-80 Color Computer. An expansion connector was added to the right side of the case for future enhancements and program cartridges (вЂњProgram PaksвЂќ), and a RAM button (a sticker indicating the amount of installed memory in the machine) covered the hole where the ModemвЂ™s LED вЂњDATAвЂќ indicator had been.

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The internal modem was removed, and I/O ports for cassette storage, serial I/O, and joysticks were provided. With its proven design, the VideoTex terminal contained all the basic components for a general purpose home computer. Internal differences, if any, are unclear, as not many AgVision terminals survive to this day. The AgVision terminal was also sold through Radio Shack stores as the VideoTex terminal around 1980. The SAM, VDG, and 6809 were combined and the AgVision terminal was born. By that time in late 1979, the new and powerful Motorola MC6809 processor was released. 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 вЂњGreen ThumbвЂќ terminal, the MC6847, along with the MC6809 Microprocessor Unit (MPU), made the prototype a reality by about 1978.

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MotorolaвЂ™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 television 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 вЂњGreen ThumbвЂќ, was to create a low cost Videotex terminal for farmers, ranchers, and others in the agricultural industry. of Austin, to develop a low cost home computer in 1977. The TRS-80 Color Computer started out as a joint venture between Tandy Corporation of Fort Worth, Texas and Motorola Semiconductor, Inc. Combined with the versatile BASIC, the robust, easy-to-interface-to design has long made it an experimenterвЂ™s favorite. The CoCo lacked some of the graphics and sound capabilities of other home computers, but made up for it in computing power and ease of programming in BASIC.

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The death knell of the CoCo was the advent of lower cost IBM PC clones, the same event that spelled the end of other models competing in the home computer market. The converse cannot be claimed, obviously, due to the greater capabilities of the newer CoCo models.

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All three CoCo models maintained a very high level of software and hardware compatibility, with few programs written for the older model not running on the newer. It was one of the more powerful 8 bit computers of its day. The Tandy Color Computer line started in 1980 with what is now called the CoCo1 and ended in 1991 with the more powerful yet similar CoCo 3. By 1986 prices for 8 bit processors had dropped dramatically from the late 70s, but the MC6809 was still just over twice the price of a MOS6502 (6809/6809E вЂ“ $5.95 MOS6502 вЂ“ $2.79). Steve Wozniak once commented that the 6502 was 1/4 the price of the Motorola 6800 when the original Apple was being developed in the late 70s.

Some of these competing machines were paired with dedicated sound and graphics chips and were much more commercially successful in the 1980s home computer market. Competing machines such as the Apple II, Commodore VIC-20, the Commodore 64, the Atari 400, and the Atari 800 were designed around a combination of the much cheaper MOS 6502, itself essentially an enhanced clone of the Motorola 6800. The Motorola 6809E was a very advanced processor, but was correspondingly more expensive than other more popular microprocessors. While the model was eventually eclipsed by the onset of the IBM PC clones, enthusiasts have continued to affectionately tinker with the вЂњCoCoвЂќ to the present day.Дespite bearing the TRS-80 name, the вЂњColor ComputerвЂќ was a radical departure from earlier TRS-80 Models вЂ“ in particular it had a Motorola 6809E processor, rather than the TRS-80вЂ™s Zilog Z80. It was one of the earliest of the first generation of computers marketed for home use in English-speaking markets. The Radio Shack TRS-80 Color Computer (also marketed as the Tandy Color Computer and affectionately nicknamed CoCo) was a home computer launched in 1980.

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