on the model) do not send a control code if they are pressed while holding both Shift and Control. When entering text, the Atari keyboard handler converts these signals into ATASCII.

ATASCII and internal codes contain the same character set, but indexed differently. ATASCII codes are used by Atari BASIC, while internal codes are used to look up how to render the character on-screen.

Atari 8-bit systems have several distinct graphics modes; these modes can be classified as pure text modes, pure

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