Just looking at the manual I think I followed the diagram for connecting J5 of the super sound I/O board with J1 of the cheap squeak and that worked OK.
These devices have been on my find again list for a while now but it never happened. If anyone has the missing ones going spare and willing to send them then I will take a shot at reversing them
it looks pretty simple on the schematic,
just enabling ram/rom and i/o at different address combinations.
the only complexity is the fact that i/o is 8bit so UDS/LDS is used and you have to handle the bus signals.