Tandy Radio Shack TRS-80 model I

I have two main units, power adapter,  Tandy Radio Shack Video Display,
Tandy Radio Shack TRS-80 expandion interface, Realistic CTR-80
Cassette Recorder and Tandy Radio Shack joystick.

type computer
country USA
year 1977
os TRS DOS, built in Basic Level 1
cpu Zilog Z70
speed 1.77 MHz
ram 4 KB
rom 4 KB
graphic 128×48
colors mono
sound none
ports monitor, cassette, expansion port