|16||Light Pen Address (High)
|-
|17 ||Light Pen Address (High)
|-
|}
Type 0
{|{{Prettytable|width: 700px; font-size: 2em;}}|''b1 ''||''b0 ''||''Function ''||''Read/Write '' |-|0 ||0 ||Select internal 6845 register ||Write Only |-|0 ||1 ||Write to selected internal 6845 register ||Write Only |-|1 ||0 ||- ||- |-|1 ||1 ||Read from selected internal 6845 register ||Read only |-|}
Type 1
b1 b0 Function Read/Write
0 0 Select internal 6845 register Write Only