MPU-401

The MPU-401, where MPU stands for MIDI Processing Unit, is an important but now obsolete interface for connecting MIDI-equipped electronic music hardware to personal computers.

For this setup, the following "interface kits" were made: In 2014 hobbyists built clones of the MIF-IPC-A card for PCs.

Products released in this manner: Still later, Roland would get rid of the breakout box completely and put all connectors on the back of the interface card itself.

[37] In 2017/2018 hobbyists developed a revision of the Music Quest PC MIDI Card 8BIT clone that includes a wavetable header in analogy of the Roland MPU-401AT.

In 2015, a PCB (HardMPU)[40] was developed that incorporates SoftMPU as logic on hardware (so that the PC's CPU does not have to process intelligent MIDI).