Advanced Teletext System User Guide

The Teletext Operating System Commands
*HON
Description
This command controls the top line display (Header) of the Teletext system. It
allows the top line to be displayed, with or without the clock. It also sets the
display to any magazine (see *MAGAZINE).
Syntax
*HON [0] Switch on the Header line with the clock display.
*HON 1 Switch on the Header line without the clock display.
The square brackets mean that the zero is optional.
Example
*TTXON
*BBC1
*HON 1
PRINT TAB(32,0);CHR$(130);"HOLD";
This will switch on the Header for BBC1, and print the word 'HOLD' where
the clock display normally goes.
Notes
This command only works if the screen display is currently Mode 7 (without
shadow) and the screen has not been scrolled since the last CLS. Scrolling
within a window does not matter. The Headers of certain services appear to
flicker; to stop the flicker, use the *MAGAZINE command.
*ITV
Description
This command selects channel 3 or 4 for Teletext reception. If no number is
given after the command, channel 3 is used.
Syntax
*ITV
*ITV 1
*ITV2
Example
*TTXON
*ITV
*PAGE 100
This will make page 100 of ORACLE the currently selected page.
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