Description #

Scans a given key group and returns a keycode. Returns with the Z flag set if no key was pressed.

Technical Details #


Inputs #

a = Key group to scan. Standard direct-input codes.

Outputs #

a = Key mask returned. As with direct input, $ff means no key pressed.
z flag = Set if no key in specified group was pressed. Reset if at least one key in group was pressed.

Destroyed #

a, b