8bits4ever MSX-Blaster OPL4
This page was last modified 10:04, 13 June 2022 by Gdx. Based on work by Mars2000you and Grauw.



The MSX-Blaster OPL4 is a MoonSound-compatible cartridge manufactured by 8bits4ever.

It is actually based on the Wozblaster, originally made by Gustavo Iriarte and later reworked by Eugeny Brychov to intregrate almost components used to control the OPL4 in a CPLD chip, thus reducing heat and power consumption.

The first version had 1MB to load and play user samples, but it has been upgraded to 2MB since version 2. There is also 2MB ROM containing 330 mono factory samples (Yamaha YRW801-M General MIDI).

Official price: €100.00 for the v1, €120.00 for the v2.


8bits4ever MSX-Blaster OPL4
8bits4ever MSX-Blaster OPL4
8bits4ever MSX-Blaster OPL4 left side
8bits4ever MSX-Blaster OPL4 PCB V1 Rev.1
8bits4ever MSX-Blaster OPL4 PCB V1 Rev.2
8bits4ever MSX-Blaster OPL4 PCB V1 Rev.2 (underside)


  • Yamaha YMF278B OPL4 sound chip
  • YAC513-M DAC
  • 1MB or 2MB Sample-RAM
  • Yamaha YRW-801 ROM (2MB)
  • Yamaha YMF278B sound chip
  • 100% OPL/OPL2/OPL3 compatible (note: the MSX-AUDIO is also OPL compatible, so MSX-AUDIO software that doesn't use the MSX-AUDIO ADPCM port can be used on the OPL4)
  • 100% Compatible with MoonSound Software
  • Wave table part: 24 PCM channels (stereo: adjustable in 16 steps for each channel; replay frequency up to 44.1kHz)
  • Replay of 8-bit, 12-bit or 16-bit data
  • FM synthesizer: 18 2-operator FM channels, 15 2-operator FM channels + 5 FM drums, 6 4-operator FM channels + 6 2-operator FM channels, 6 4-operator FM channels + 3 2-operator FM channels + 5 FM drums.
  • Compatibility with the General MIDI standard (128 melody sounds and 47 percussion sounds)
  • External stereo audio output (TRS 3.5mm jack)
  • Internal mono audio output to MSX

Since V2 rev.2.5, it includes a high signal-to-noise ratio circuit fix for better audio output.

See OPL4 page for more specifications.