Vintage Pioneer BM-4100 Data Transmitter Main PCB EIDEN Video Encoder Vintage IC

Pioneer BM-4100 Data Transmitter Main PC Board. I believe this was made by EIDEN and used to encode data over analog video. Contains vintage ICs, a few are socketed...

• 7400 6DB 280 (socketed)
• Hitachi HD63B50P (socketed)
• Mitsubishi 80011A (socketed)
• Various 74HC-series ICs, ~80s Japanese