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TRS-80 Model 4
May 1983, Radio Shack introduces the TRS-80 Model 4, with 4-MHz Zilog Z80A microprocessor, 16KB RAM, cassette or 180KB 5.25-inch floppy drives, keyboard, 80x24 text 12-inch B/W monitor, optional CP/M, speaker, Model III Basic in ROM, for US$2000. 
  • Z80A CPU
  • 64K RAM
  • 1 Parallel port
  • 1 I/O Bus connector
  • 1 RS-232C connector
  • 1 Cassette I/O
  • Model; 26-1059
  • SN; 61
Click here for a brief history of Radio Shack Computers.