Tape was before ISAM iirc - things like merge-sort were big then, and the spinning tapes you'd see in those old black and white movies from the 60's. ISAM neede

Tape was before ISAM iirc - things like merge-sort were big then, and the spinning tapes you'd see in those old black and white movies from the 60's. ISAM needed disks, and so did RDB's