The WRITING command is used to control how the text is presented on the screen.
The first value selects one of five writing modes:
* REPLACE
(0) – new text replaces any existing screen data;
* OR
(1) – merge new text with screen data, using logical OR;
* XOR
(2) – combine new text with screen data, using XOR;
* AND
(3) – Combine new text and screen data, using logical AND;
* IGNORE
(4) – ignore all subsequent printing instructions.
A number set as the optional second value selects which parts of the
text are to be printed on the screen, as follows:
* NORMAL
(3) – Print text and background together;
* PAPER
or PAPER ONLY
(1) – paper only the background to be drawn on screen;
* PEN
or PEN ONLY
(2) – ignore paper colour and print text on actual background.
The default value for both of the WRITING
parameters is three (3
),
giving normal printed output.
WRITE {[mode]},{[parts]}
WRITING REPLACE,PEN WRITING 3,
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WRITING ↔ Wrt
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