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MPU(4) Device Drivers Manual MPU(4)

mpu —
Roland/Yamaha MPU401 MIDI UART device

mpu* at isa? port 0x300
mpu* at isapnp?
midi* at mpu?

The mpu driver provides support for the Roland/Yamaha MPU401 (and compatible) MIDI UART cards.
Access to the device is through the MIDI driver.

isa(4), midi(4)

The mpu device driver appeared in OpenBSD 2.6.
March 19, 2009 OpenBSD-5.8