The AY 3 8912, YM 2149 and the Mixer PCB are available at Mikes Onlineshop

• AY 3 8912 & YM2149 PCB Interconnections

AY 3 8912 board PCB Layout+Parts List:

• mbAY38912.pdf
• mbay38912pcbpartlistv1.txt

YM2149 Board Parts list:

• PartlistYM2149PCB.txt