MEEP

(Multi-channel EEP Engine Program) (the "EEP" representing the sound of a beep)

My second 1-bit sound engine. Assemble using fasmg. I use fasmg because its macro capabilities are practically required for a project with tons of SMC and dynamically relocated code like this.

See format.asm for song data format instructions. See songs for song examples. See my youtube channel for the examples, played back and recorded with oscilloscope visualizations.

Note: this is still in development. There is not yet any interface for playing or selecting songs, and there will be bugs.

Writing your own songs

I recommend checking out songs/zelda_4swords. At some point it'll be able to read from an appvar, but for now I need to assemble to .bin and then include said .bin in the resulting .8xp (see test/test_zelda.z80).

What to assemble

what works:

• test/test_bitbang.z80 to test bitbang.z80 (might be broken by now, idk)
• test/test_canon.z80 to include songs/canon/canon.z80 and play it as described in the youtube video
• test/test_drum.z80 to test a few drum sounds
• test/test_vib.z80 to test vibrato (I used this to debug vibrato stuff at one point)
• test/test_zelda.z80 to embed songs/zelda_4swords/zelda_4swords.bin in the program and play it, as featured in this youtube video
• songs/zelda_4swords/zelda_4swords.asm (make sure to specify songs/zelda_4swords/zelda_4swords.bin as the output file) to generate the file needed by test/test_zelda.z80

what doesn't work anymore:

• test/test_driver.z80 at some point I used this to test driver.z80 but I don't think it works anymore

also, note: all of the test_*.z80 files are named prgmA on-calc

You may want to change cpuspeed.z80 to tune the notes to your own calc. Check the file for instructions. (at some point this is supposed to measure the CPU speed and tune itself automatically, but that's not implemented yet)