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| ''Bit 7'' || ''Bit 6'' || ''Function''
|-
| 0 || 0 || Select pen
|-
| 0 || 1 || Select colour for selected pen
|-
| 1 || 0 || Select screen mode, ROM configuration and interrupt control|-| 1 || 1 || RAM Memory Management (note 1)
|-
| 1
| 1
| RAM Memory Management (note 1)
|}