Source:Technisphere Corp., New York, NY (1970)
IBM. Tape Specifications for IBM One-half Inch Tape Drives at: 556 and 800 BPI and 3200 FCI. Blue-faced booklet includes general information, description and requirements for tape properties essential for IBM tape drive use. Graphs and tables describe the 2420 Wraparound Cartridge and the Write-Enable Ring.