When you enable 6-dot Braille mode, the use of dots 7 and 8 on the input keyboard is lost, they are ignored completely except in chord commands and if enabled to perform editing functions when pressed alone.

To reenable the use of dots 7 and 8, so that you can press these dots together in conjunction with a Braille character to produce a control character, use the option symbol "&" (ampersand sign) in the driver configuration string.

For example, pressing dots 13478 results in Control+M.

The action of the "&" option depends upon the 6/8 dot setting of Braille dots mode. If 6-dot mode is active, "&" enables the use of dots 78 as a control modifier, as above. But if this option is used when 8-dot Braille mode is in effect, it disables control modification with dots 78. Thus the order of these options in the driver configuration string is important: if you want 6-dot Braille mode with dots 78 enabled, you must use "6&", not "&6", which would leave dots 78 disabled as part of the 6-dot mode setting.

Note that the setting of dots 78 together as a control modifier is independent of the setting of dot 7 on its own as a shift modifier, which works if enabled even if dots 7 and 8 together are disabled.

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Using Dots 78 as a Control Modifier