Important notes:

- The HR-16 sound ROMs only work with the HR-16 firmware,
  and the HR-16:B ROMs only work with the HR-16:B firmware.
  Both versions of the HR-16 can use both sets of sounds and firmware.

- The OS ROMs are 27C256 (32k x 8bit) EPROMs.

- The sound ROMs are 27C040 aka 27C4001 (512k x 8bit) EPROMs.

- If you want to exchange the sounds, the ROM marked "U16" is the first one,
  containing the bassdrums, snare drums, and hats/cymbals, the one marked
  "U15" is the second one containing toms and percussion.
  Follow the instructions on http://burnkit2600.com/gear/hr-16-diy-sound-roms/

- Have fun!

