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Setting up Screens


Here is a table which lists the different screen options, along with an indication of the amount of memory a standard size screen will consume.

Colours    Resolution    Memory    Notes
2          320x200       8k        PAPER=0 PEN=1 no FLASH Cursor=1                           
2          640x200       16k       as above 
4          320x200       16k       PAPER=1 PEN=2 FLASH=3 Cursor=3
4          640x200       32k       as above
8          320x200       24k       PAPER=1 PEN=2 FLASH=3 Cursor=3
8          640x200       48k       as above
16         320x200       32k       default setting
16         640x200       64k
32         320x200       40k
64         320x200       48k       Extra Half Bright mode
4096       320x200       48k       Hold And Modify mode

Controlling screens

SCREEN CLOSE
instruction: erase a screen
Screen Close number

Use the SCREEN CLOSE command to erase a screen and free the memory it was using for other programming needs. Simply specify the screen number to be deleted.

DEFAULT
instruction: re-set to the default screen
Default

The DEFAULT instruction closes all currently opened screens and restores the display back to the original default setting.

AUTO VIEW ON
AUTO VIEW OFF
instructions: toggle viewing mode on and off
Auto View On
Auto View Off

When SCREEN OPEN is used to create a new screen, the screen is usually displayed at once. This may be inconvenient during the initialisation stages of a program, in which case the AUTO VIEW OFF command can be used to disable this automatic display system. Screens can then be updated at a convenient point, using the VIEW instruction. To re-activate the automatic screen updating system, use the AUTO VIEW ON command.

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06.01.03