Window input

Text windows support the INPUT command. If you use INPUT #, then a cursor is added to the window at the current position. You can then input any text desired, using the left and right arrows to move along the text input so far, or the up and down arrows to move to the start or end of the text.

The DELETE key deletes the character to the left of the cursor, and the ENTER key completes the input. Up to 191 characters can be accepted into each input variable.

Window definitions

Since windows are defined using character squares so for example in LoRes, this means the maximum window size is 16 × 12 (and not 32 × 24). In HiRes however, character squares are considered to be 16 pixels wide, so the maximum window size is still 32 × 24 pixels.

Memory constraints

It should be noted that saving/loading window contents (only available on user windows) is a costly operation. The amount of memory required for each character square is:

• 9 bytes (Layer 0)
• 16 bytes (Layer 1 HiRes or HiColour)
• 64 bytes (Layer 1 LoRes or Layer 2)

For example, a 10 x 10 window in Layer 2 requires 6400 bytes of available memory for saving its contents.