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GMC-OPM: OPM Module †

A module mounted with an OPM(YM2151) sound chip.

OPM is an eight-channel, four-operator FM sound chip.
It differs from the OPN series in that it has hardware LFO and the DT2 parameter.*1
These grant OPM a wider range of sound creating possibilities.

Features †

• Authentic YM2151, the FM LSI from YAMAHA used by SHARP X1 and X68000, as well as various arcade game systems and digital synthesizers.
  Currently the module doesn't support X1's SSG, X68000's ADPCM, or PCM sounds of arcade game systems.*2

SHARP X1、X68000、アーケード基板、シンセサイザー等で使用されていたYAMAHA製FM音源LSI「YM2151」が付属するモジュールです。
※X1のSSG音源、X68000のADPCM、アーケード基板のPCMには現状対応していません。*3

• High clarity of sounds attained through abundant use of high quality components and extensive revision to the original board design of the 80s to meet the modern standard.

• Variable clock rate that can be set to anything within the module's operating frequency (3MHz-4MHz)*4 This first in the indie hardware feature enables a highly faithful emulation of arcade game sound systems, whose clock rate is not always uniform.*5
  Clock rate gets instantly adjusted at the start of each song.
  

3 MHz

4 MHz

• Ability to be remounted with another sound chip which is pin-compatible with OPM, such as YM2164 (OPP). The IC socket makes the replacement quite effortless.*6