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Clarify "Setting the Active Position" instructions

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G.K.MacGregor
2020-10-18 21:06:59 +01:00
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@@ -55,9 +55,10 @@ By checking "raw values" it is also possible to view and edit the raw Address, M
The full behaviour of X/26 enhancement triplets can be found in section 12.3 of the [Enhanced Teletext specification ETS 300 706](https://web.archive.org/web/20160326062859/https://www.phecap.nl/download/enhenced-teletext-specs.pdf). The full behaviour of X/26 enhancement triplets can be found in section 12.3 of the [Enhanced Teletext specification ETS 300 706](https://web.archive.org/web/20160326062859/https://www.phecap.nl/download/enhenced-teletext-specs.pdf).
### Setting the Active Position ### Setting the Active Position
The Active Position, whether set explicitly by a row or column triplet, can only be moved in screen address order i.e. from left to right within a row and then from top to bottom across rows. In other words: The Active Position, whether set explicitly by a "Set Active Position" triplet or by a row or column triplet, can only be moved in screen address order i.e. from left to right within a row and then from top to bottom across rows. In other words:
- The Active Position can never be moved up to a lesser numbered row. - The Active Position can never be moved up to a lesser numbered row.
- The Active Position can never be moved left *within the same row* to a lesser numbered column, but it can be moved left at the same time as it is moved down to a greater numbered row. - The Active Position can never be moved left *within the same row* to a lesser numbered column, but it can be moved left at the same time as it is moved down to a greater numbered row.
If this rule is not followed then triplets in earlier screen addresses will be ignored. If this rule is not followed then triplets in earlier screen addresses will be ignored.
### Objects ### Objects