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When the mode group is selected, the byte output will be interpreted as follows: | When the mode group is selected, the byte output will be interpreted as follows: | ||
<pre>Bit 0 | <pre>Bit 0: ULAplus palette on (1) / off (0) | ||
1 | 1: (optional) greyscale: on (1) / off (0) (same as turing the color off on the television) | ||
2 | 2: (optional) planar mode: on (1) / off (0) | ||
3 | 3: (optional) planar mode: 3 planes (0) / 4 planes (1).</pre> | ||
Implementations that support the Timex video modes use the #FF register as the primary means to set the video mode, as per the Timex machines. It is left to the individual implementations to determine if reading the port returns the previous write or the floating bus. | Implementations that support the Timex video modes use the #FF register as the primary means to set the video mode, as per the Timex machines. It is left to the individual implementations to determine if reading the port returns the previous write or the floating bus. | ||