VTG 1984 Casio PT-80 Mini Electronic White Keyboard Organ Tested w/Rom 551

Comes with Rom 551 World Songs. Needs 5 x AA Batteries (Not Included) Or 7.5v power cord ( Not Included ).
There is a crack in the rom cover (See last picture, top). The volume is sensitive. Once in a while after starting the keyboard volume seems low, moving the volume slider fixes it. Is pre owned used condition. No Manual