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Enables the display drivers.

Syntax VDU 6
Keyboard equivalent CTRL F
Character stream (hex) 06
Description Causes all subsequent characters to be sent to the display drivers.


VDU 6, or CTRL F, enables the display drivers. From this point on VDU commands are acted upon, and characters outside a VDU sequence are printed on the screen; this is the default state on soft reset. The command undoes the effect of VDU 21.

This mechanism is separate from OSBYTE &03, which can disable the display by blocking the flow of characters to VDUCHR. To use this command OSBYTE 03 must be set to enable the display, so that the drivers may receive the command character and subsequent characters to print.

-- beardo 21:33, 24 September 2007 (BST)