Could it be JP1 compatible?
That look like is JP1 pin out to me:
I've tried to gather as much informations as I could:
Type of the remote: RAV364 WJ16560 EU
Type printed on a sticker in the battery compartment: RC1598015/00
Here is the schematics and some additional information taken from a Yamaha service manual:
http://rosa.mywia.cz/Yam1.gif
http://rosa.mywia.cz/Yam2.gif
http://rosa.mywia.cz/Yam3.gif
http://rosa.mywia.cz/Yam4.gif
It seems the CPU is a Zilog Z86L87/89/73, here are two data sheets:
http://rosa.mywia.cz/73841.pdf
http://rosa.mywia.cz/z86l87_89_73.pdf
I've tried to read the remote with the simple parallel JP1 interface using IR but "no remote found" - no surprise.
Is there any chance or should I forget it?