Philips 22AC990-00 old vintage car stereo radio and cassette player from 1980

Maybe the production started in 1978, maybe the first digital Philips car radio, seems unused, with ovners manual. It's a very different logic of operation, very confusing to store stations in memory. In theory, you should be able to store 10 different frequencies of the same station under one button (P1 - P6) in order to automatically select the strongest one (the AF function of today's car radios). But everything remains in the memory even after disconnecting the battery! In addition, it is possible to connect an external search switch to the radio, even to the steering wheel! With a very good sound, but unfortunately the sensitivity, especially noise in stereo mode is too high (Stereo needs a strong signal), not possible to tune out. Final amplifier based on TDA1010. And two microprocessors (2 x MK3870N)! Electromagnetic lock on the radio frame.