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{{Port
|Number=$BF3B
|ShortDesc=ULA+ Register
|Readable=?
|Writable=Yes
}}

bits 7:6 Select register group

* 00 = palette group
* 01 = mode group

bits 5:0 Writes data

*  if bits 7:6 = 00, selects an index 0-63 in the ula+ palette
*  if bits 7:6 = 01, ignored (changing timex video mode is incompatible with existing ULA+ software)

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