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The company Radio Shack (also Tandy) produced two different home computer systems:

  1. TRS-80 with Z80 CPU, since 1977 (compatible with the Video Genie, line since 1981):
    • Model I/III/4
    • Model II/16/12
  2. TRS-80 Color Computer (also known as "CoCo") with MOS Technology 6809 CPU:
    • CoCo 1: with lower RAM, since 1980 (compatible with the Dragon 32/64, since 1982).
    • CoCo 2: the same design as model, also with more RAM (up to 64 KB) and compatible with OS-9, since 1983.
    • CoCo 3: expanded graphics and a minimum of 128 KBRAM, since 1986.

[edit] Links

WP-W11.png Wikipedia: TRS-80
WP-W11.png Wikipedia: TRS-80_Color_Computer
WP-W11.png Wikipedia: Video_Genie
WP-W11.png Wikipedia: Dragon_32/64
WP-W11.png Wikipedia: OS-9
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