Tandy TRS-80 
Radio Shack

Produced: 	1977
Processor: 	Z80
CPU clock: 	1,77 MHz
RAM:		4 kByte, internally extendable to 16 kByte
			externally with expansion bay plus 32 kByte to 48 kByte
ROM:		4 kByte (Level 1) / 12 kByte (Level 2)
OS:			TRS-DOS, Level 1 Basic, Level 2 Basic, NEWDOS/80, DOSPLUS, VTOS, LDOS
Text mode: 	64 x 16, monochrome
Graphics: 	128 x 48, monochrome
Colors: 	none
Keyboard: 	53 keys
I/O:		tape recorder port (500 bps) 
			with expansion bay: Centronics, RS-232