NEC PC 8201A Accessory?

Marvin: What you have there is a break-out box for AMPS cellular telephones. You put the box between the phones handset and tranceiver unit, and you can tap into the audio circuits of the phone. In the early days of cellular radio, any phone that was listed as "AMPS complete" could be used with the handset of any other phone likewise listed. This was done to give third-party equipment supliers the opportunity to make custom accessories that would work with a variety of phones. The 1985 seems to confirm that this was used for testing these "AMPS complete" cellular phones (they were about all that was available then). The computer probly had some test software on it, to send commands to the tranceiver. BTW, interfaces like this were also used with cellphones as system diagnostic tools for cellular networks, to analyze coverage areas and call quality. The amps complete phone is almost non-existent today. Most (if not all) now use a proprietary communication scheme between the handset and tranceiver. Most phones for sale today, as you know, don't even have this connection; the tranceiver and handset are all one unit. The true "AMPS Complete" phone is a bit of a classic in of itself! Jeff P.S. = Mod = Modulator RSSI = Receiver Signal Strength Indicator NRZ = Non-return to Zero data used by the phone for control. Bit Clock = Recovered clock for the above datastream