Xerox 820-II

I have the main unit, monitor and keyboard.

type computer
country USA
year 1982
os CP/M 2.2, MS Basic-80
cpu  Zilog Z80A
speed 4.0 MHz
ram 64 KB
rom 6 KB
disk 2 x 8″ floppy
graphic CRT black&white 80×24,
4×4-resolution graphic
colors mono
ports 2 x serial RS232, 2 x parallel