First post, by Boohyaka
Got myself a MPU-401 breakout box from a retired musician. It wasn't used in years but was perfectly stored and looks great. He didn't have anything else though - no interface card, no cable.
Purchased a regular DB25 cable (from what I've read from Great Hierophant's blog, it should be fine?) and a MIF-IPC-B clone card (pre-assembled).
I left the interface card config by default, so 330h IRQ2/9. I booted and...immediately noticed computer sounds coming out of the small piezo speaker inside the MPU-401, definitely at a level that cannot be normal. Tried to run stuff and it is not properly detected (DOSMID says "MPU not detected", and running games, no midi message is received by the MT-32). Trying to send a command with MPUTHRU.COM freezes the computer.
Thing is, I usually have a PCMIDI MQ clone in that computer, running at default 330h IRQ2/9 as well, and running perfectly fine, so I doubt it is an interface card settings problem or conflict?