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Variables
VideoCard :Array [MonoCard..ColorCard] of OneVideoCard
This holds information on the one or two cards in the system.
Card :MonoOrColor
This determines the currently active card.
TextAttr :Byte
This has the background colour in the left nibble and the text
colour in the right nibble.
LastMode :Byte
This is defined on startup. It contains the video mode before the
program started. Unlike the CRT.LastMode variable, it is
not updated with every call to TextMode.
Cursor :Boolean
If Cursor is True then procedures such as WriteStr move the
flashing cursor when they are called. If however Cursor is False,
the cursor position is not updated and is left where it is. This is
by default True but can be changed by the user at any time during
the program.
VX :Word
The position of the cursor on the virtual screen.
VY :Word
The position of the cursor on the virtual screen.
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