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TRS-80 model 4P
In october 1983, Tandy Radio Shack announces the "transportable" TRS-80 Model 4P, for US$1800. 
  • 4-MHz Zilog Z80A CPU
  • 64KB RAM
  • Two 5.25-inch floppy drives capable of storing 180k per side
  • 9" monochrome screen 80x24
  • 1. Parallel
  • 1. I/O Bus
  • 1. RS232C serial.
The operating system was TRS-DOS 6.0 to 6.2, LS-DOS 6.3.

The back of the model 4P
Click here for a brief history of Radio Shack Computers.