Here are some identifications I have made on the US Turbografx CDROM PCB. This was mostly for my own reference, but maybe someone else has some use for them.
/turbocdpcbtop1.jpg
/turbocdpcbbottom1.jpg
/turbocdpcbsub1.jpg
Over time I will be putting together a more complete collection of technical information concerning the Turbografx CDROM unit.
Nice work