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The item up for sale is a Tarbell S-100 Cassette Interface Rev D. I bought it several years ago but decided not to use cassette storage. So, I am selling it. I never used it but I have tested all of the TTL chips on board, so I am confident that all of the chips should work. However, due to its age it is being sold AS-IS
I will include a copy of the manual printed from the PFD file.
Thank you for looking and GOOD LUCK !!