Acoustic Coupler, Otrona Attache 8-16 Technical and User Manuals and Custom and Standard Software as supplied (5” discs in each folder)

Documentation, Price Lists, Complete CP/M BIOS listing, 8-16 update specifications (fitted) and block diagrams from the technical manual

Original 1981 sales and specification leaflet: both sides shown

Front and rear views with ports visible

Boston Otrona User Group listing of software and US pricing

300baud Acoustic Coupler: this was REAL portable I used, 1982 on

Otrona Attache keyboard label clip for Bios and program commands