#menu(MenuBarEng)

* GMC-OPM: OPM Module [#g992fb59]

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.((OPNA does have hardware LFO, but it's somewhat rudimentary compared to that of OPM.))~
These grant OPM a wider range of sound creating possibilities.

#ref(GMC-OPM_PCB.jpg)

#contents

**Features [#tdfba1d2]

- ''Authentic YM2151'', the FM LSI from YAMAHA used by SHARP X1((To use G.I.M.I.C as an external sound source for X1 emulation, you need to have multiple G.I.M.I.Cs connected to your PC.)) and X68000((G.I.M.I.C with the USB-controlled firmware does not play ADPCM sounds; they are played with the PC's sound card instead.)), as well as various arcade game systems and digital synthesizers.~
- ''Authentic YM2151'', the FM LSI from YAMAHA used by SHARP X1((To use G.I.M.I.C as an external sound source for X1 emulation, you can connect two or more G.I.M.I.Cs to your PC for more faithful reproduction.)) and X68000((G.I.M.I.C with the USB-controlled firmware does not play ADPCM sounds; they are played with the PC's sound card instead.)), as well as various arcade game systems and digital synthesizers.~

- ''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). This first-in-indie-hardware feature enables a highly faithful emulation of arcade game sound systems, whose clock rate is not always uniform.~
'''Clock rate gets instantly adjusted at the start of each song.'''
~

3 MHz~
#ref(CLK_3M.png)~
4 MHz~
#ref(CLK_4M.png)~

-''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.((Mounting OPP will not bring any change to the module's function.))~


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