Alat penembak electron dikendalikan oleh dua sinyal dijital terpisah, satu video bit, dan suatu bit intensitas untuk mengendalikan kecerahan brightness piksel yang dipakai.  Hanya empat warna/nuansa yang dimungkinkan, hitam, redup, medium, atau cerah
The electron gun was controlled by two separate digital signals, a video bit, and an intensity bit to control the brightness of the drawn pixels. Only four shades were possible; black, dim, medium or bright.