Hi there,
I know this a is little bit OT and may be not very contemporary:
I have bought an old DX7S and thought about building a RAM-Cartridge by myself. Maybe someone here has some experience with this or knows where to find completed eagle files or a pcb to do this.
Best regards,
clem!
Do you have the schematics for these cartridges? If so, the layout should not be a major problem.
Thx for the reply ilmenator,
I didn’t found any schematic for the Yamaha RAM4 or RAM5 on the web but I have a service-manuals for DX7II and you can find pics of the PCBs of the RAM-Cartridges - so you are right. But I never worked with eagle and the spacing of the pins of the cartridge port is a bit uncommon, so it would be helpful not to start from scratch. Perhaps etching a breadboard-catrtridge will do it. But I don’t know how to create a matching connector in eagle.
BTW Kölle am Rin is my old Heimat 
but that was 25 years ago.
Best,
clem!