X: invalid
command is sent. The logical OR, EXOR, AND of text or graphic display can be displayed. In Internal
Character Generator mode, character codes 00H to 7FH are assigned to the built-in character generator
ROM. The character codes 80H to FFH are automatically assigned to the external character generator
RAM.
(Example)
(Note) Attribute functions can only be applied to text display, since the attribute data is placed in the
graphic RAM area.
Attribute function
The attribute operations are Reverse display, Character blink and Inhibit. The attribute data is written
into the graphic area which was defined by the Set Control Word command. Only text display is
possible in Attribute Function mode; graphic display is automatically disabled. However, the Display
Mode command must be used to turn both Text and Graphic
on in order for the Attribute function to be
available.
The attribute data for each character in the text area is written to the same address in the graphic area.
The Attribute function is defined as follows.
Attribute RAM 1byte
≮≮≮≮d3 d2 d1 d0
d3 d2 d1 d0 FUNCTION
0 0 0 0 Normal display
0 1 0 1 Reverse display
0 0 1 1 Inhibit display
1 0 0 0 Blink of normal display
1 1 0 1 Blink of reverse display
1 0 1 1 Blink of inhibit display
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