Just thought I'd pass along the title of a very cool book I found. It's called "Digital Magnetic Tape Recording: Principles and Computer Applications" by Bernard Bycer (1965). I imagine this would be very useful for those wanting to develop their own storage systems for re-creational computing projects. I found my copy on ABE for US$8.00. Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org