|754|$02F2|CH1|prior key pressed|all

Prior keyboard character code (most recently read and accepted). This is the previous value passed from [CH] (764/$2FC). If the value of the new key code equals the value in CH1, then the code is accepted only if a suitable key debounce delay has taken place since the prior value was accepted.

see also: [Keyboard topics|Keyboard_topics], [CH]