Answer: eighttrack

AnswerCrossword Clue
EIGHTTRACKObsolete analog tape system
EIGHTTRACKTwo balls, and a tape
EIGHTTRACKObsolete tape format
EIGHTTRACKTape type
EIGHTTRACKOld tape format
EIGHTTRACKCassette tape forerunner