RP2A03 · 1983 · FIVE CHANNELS · NSF
2A03

A sound chip with five voices, and a decade of music written inside them.

Five channels
and no more
  1. 01Pulse 1
  2. 02Pulse 2
  3. 03Triangle
  4. 04Noise
  5. 05DPCM
RICOH RP2A03
NESdev Wiki, APU
Close-up of an RP2A07A chip labeled 1HM 2V mounted on a green circuit board

Four decades, and only one of them is 1985

The full run is in the archive →

On, or off

The triangle channel has no volume register

Every bass note on the machine plays at exactly one loudness. Composers wrote rhythm where other machines wrote dynamics, and the walking bass of the whole catalogue follows from it.

A bass line you cannot make quieter →

Thirty-two steps, four bits, one amplitude · NESdev Wiki, APU Triangle

A CRT glowing in an otherwise dark room, close
FIG. 2Balance decisions were made against sets like these — one small speaker in a wooden cabinet, mono, across a living room.Photo: Uday Veeru / Pexels