Ultima 5 Multi-instrument MIDI mods (for review only)

[code-bythepound]

This is a modification based on the work of "Cloudschatze" in his article and presentation here: https://forum.vcfed.org/index.php?threads/how-you-could-have-been-playing-ultima-v-in-1988.61980/. His change allows a Roland U-110 MIDI module to receive the stock MIDI sequence from U5 and remasters that uni-channel MIDI sequence into a multi-channel (ie: multi-instrument) sequence on-device. My change takes his mappings and ranges and converts them in real time to General MIDI instruments and tunings providing a similar experience.

TO TEST: launch U5. Go to Activate Music -> Change Music Configuration, add Passport to slot 2, and hit enter. In the Midi Information screen, select Channel 1 (default), 16 voices, and then enter the numbers 1-15 for "Midi Number" in each song (where Ultima Theme is '1' and Rule Britannia is '15'). Then hit enter on each song to play.

Still TODO:

• Cleanup of code and debug prints
• Add ability to detect U5 and turn on this change only in that game (the mods are always on in the current change). I tried but failed to do this as U5 seems to reload large sections of code during gameplay and setup from disk.
• Possibly tune the instruments, but this is of lower priority.
• Possibly add more of the U-110's MIDI controller type support, but not all MIDI devices will support this.

I have had the best luck testing with https://signal.vercel.app/ for WebMIDI.

[ct6502]

This looks awesome. I haven't had a chance to try it yet, but in the meantime, you can detect Ultima V by looking at memory address 0x202. It contains the data [0x55, 0x4C, 0x54, 0x49, 0x4D, 0x41, 0x35], which spells out "ULTIMA5". I don't know if this was true in the original game as well, or is just because of the ProDOS port, but that string seems to stay there for the entire game.

[code-bythepound]

Great, that worked. I'll get this finished up.

[code-bythepound]

Ok, should be ready for review. Thanks.