kdc-c800
http://www.mictronics.de/?page=cdc_proto#Kenwood
pin direction description
1 O CH-REQH - Request output to changer; "Low" : Request
2 - Ground
3 - Vcc +12V
4 O CH-CON - Changer control; "High" : Operation mode "Low" : Standby
5 I CH-MUTE - Mute request from changer; "High" : Mute
6 - AGND - Audio Ground
7 O CH-RST - Reset output to changer
8 I Audio right channel
9 I CH-REQC - Request input from changer; "Low" : Request
10 I CH-DATAC - Data input from changer
11 O CH-DATAH - Data output to changer
12 I Audio left channel
13 I/O CH_CLK - Clock input/output for changer
ftp://docs.kenwoodusa.com/manuals/OM-KDC-C800-1992-KUSA.pdf
http://www.minidisc.org/manuals/kenwood_kmdps970r.pdf
http://instrukcje.elektroda.net/caudins.htm