Thanks for Kyle's discussion of yet another audio cartridge format in use for data storage; and for remarks by Michael Thompson and Matt Patoray. I've added that content today to the cassette-data Web page. Maybe in the future, I'll move it to my PDP-8 Web pages. In the 1960's and 70's, PDP-8's were the "embedded controller" of that period. Just needed a bigger bed. The 8's also used Phillips-type cassettes recorded in a digital format and driven by logic-controlled drives. DEC had such a product, and I know of another product used on PDP-8's to operate commercial sewing machines. The Phi-Deck digital cassette product was available on some microcomputers of the mid-1970's including the Digital Group; a similar product was part of the MCM/80 8008 computer of the early 1970's. Details linked from my Web page above. Richard Cini, my old friend and S-100 colleague, and I are talking about the cassette-decoding software he mentioned in his post. I'll update my Web page accordingly. I recall some hobby efforts to use 8-tracks on microcomputers, but (ka-THUNK) they weren't all that convenient, and many 8-track drives were "read only". Herb -- Herbert R. Johnson, New Jersey in the USA http://www.retrotechnology.com OR .net