Onkyo MD-105FX
One of the few Hi-MD decks, and the smallest one out there. It is quite similar to its normal MD predecessor the MD-105. While this device does support Hi-MD, it unfortunately is not a netMD device.
The MD-105FX has the unusual honour of being the second and last Hi-MD component ever released. Part of Onkyo’s INTEC205 range, it combines gracefully with Onkyo’s other INTEC205 components to form a mini component Hi-Fi system.
Forum thread with teardown photos
Content adapted from: minidisc.org Onkyo Press Release (archived) release date announcement
Manuals
DSP is Sony CXD2687-001GG (combined ATRAC/servo and microcontroller)
We can find details of the pins and connections on this DSP by looking at the Sony Service Manual for the MZ-RH1.