Tecnobytes OPL4 Shockwave 2
This page was last modified 13:53, 14 June 2021 by Mars2000you. Based on work by Gdx and Grauw.


The OPL4 Shockwave 2 is a MoonSound-compatible sound cartridge manufactured by Tecnobytes.

Compared to the first OPL4 Shockwave the size was reduced, and the Sample-RAM doubled.

The 2x RCA connectors were also replaced with a jack socket, and it now outputs (in mono) to the internal MSX audio as well.


  • Yamaha YMF278B OPL4 sound chip
  • Sanyo LC78815M DAC
  • 2 MB Sample-RAM
  • Yamaha YRW-801 ROM
  • External stereo audio output (TRS 3.5mm jack)
  • Internal mono audio output to MSX

See OPL4 page for more specifications.