The Tandy TRS-80 Color Computer had nothing to do with the previous TRS-80 models, and is not compatible. Tandy developed it's own version of Tandy Color Basic for this machine. The Dragon 32 was a clone of this computer.

The CoCo model 1 runs on the Motorola 6809E processor clocked at 0.89MHz. By programming the clock generator, speeds of 1.8MHz could be achieved.

Expansion Ports:

• Expansion/Cartridge port
• Two analog joystick connectors
• Cassette Interface, 1500 baud
• RS232 Serial port
• RF TV connector

The Motorola 6809 is an 8-bit microprocessor with some 16-bit features. It was designed by Motorola's Terry Ritter and Joel Boney and introduced in 1978. Although source compatible with the earlier Motorola 6800, the 6809 offered significant improvements over it and 8-bit contemporaries like the MOS Technology 6502, including a hardware multiplication instruction, 16-bit arithmetic, system and user stack registers allowing re-entrant code, improved interrupts, position-independent code and an orthogonal instruction set architecture with a comprehensive set of addressing modes.

The MC6847 is a video display generator (VDG) first introduced by Motorola and used in the following machines (this is not a full list):

• TRS-80 Color Computer
• Dragon 32/64
• Laser 200
• TRS-80 MC-10/Matra Alice
• NEC PC-6000 series
• Acorn Atom
• APF Imagination Machine

The VDG is a relatively simple display generator compared to other display chips of the time. It is capable of displaying alphanumeric text, semigraphics and raster graphics contained within a roughly square display matrix 256 pixels wide by 192 lines high.

The ROM includes a 5 x 7 pixel font, compatible with 6-bit ASCII. Effects such as inverse video or colored text (green on dark green; orange on dark orange) are possible.

The MC6847 is capable of displaying nine colors:

• black
• green
• yellow
• blue
• red
• buff (almost-but-not-quite white)
• cyan
• magenta
• and orange