The function of bits 1 and 0 is to define the screen mode. The settings for bits 1 and 0 and the corresponding screen mode are given in the table below.
{|{{Prettytable|width: 700px; font-size: 2em;}}class="wikitable"|-| ''!Bit 1'' || ''!Bit 0'' || ''!Screen mode''
|-
| 0 || 0 || Mode 0, 160x200 resolution, 16 colours
==== Summary ====
{|{{Prettytable|width: 700px; font-size: 2em;}}class="wikitable"|-| ''!Bit'' || ''!Value'' || ''!Function''
|-
| 7 || 1 || rowspan="2" | Gate Array RMR register