Duration: 3:15

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The SMPTE/MIDI card was already 99% implemented, and only required a tiny amount of debugging to actually wire up the Tx/Rx clocks to the four 6850 ACIAs that are used to manage the four MIDI-out and three MIDI-in ports on the emulated CMI IIx.

Here's a brief video of me noodling around using a few patches (brass and vox) using my DSI Prophet 12 hooked up to my PC via USB-MIDI, and plumbed into the emulated MIDI-in ports exposed by the CMI IIx driver that MAME can plumb outward to the host OS.