I'm curious as to whats inside the CD interface units. I am wanting to mod my Sharp X1-Twin with a CD drive. Nothing will be harmed in this mod and will be completely removable. I can trace all the internal connections on the PCE interface on the SharpX1 and compare those to a traditional PCE. What I'm not familiar with is the IFUs. I have only ever had a Duo and a standalone TG-16, but never messed with the CD addons before.
Ideas?
Memory, save space, not much else, but it's done in a late 80s sort of way so there are a lot more components than what would be needed nowadays.