Twin ("a literal twin-channeled cover")

This is a source code to the Atari 2600 music demo "Twin". It also contains the code for the software pitch driver called TIunA which works by changing between two pitch registers at a very fast speed at the right time. It is located in main.asm.

Watch the demo here. (the main flashy lines are replaced though)

Original song by Petriform. Cover by Abstract 64. Code by Natt.

Building

Following programs are required:

• Furnace 0.6.5
• 64tass

Open twin_tia_ayce.fur in Furnace and do a TIunA export as song.asm with these parameters:

• base song label name: twin
• max size in first bank: 1024
• max size in other banks: 4048

Then run following commands:

64tass -C -a -b -o ayce-twin.bin main.asm