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SFG is a FM Sound Synthesizer Unit
cartridge that has its reserved 3rd slot
cartridge on the Yamaha CX5M/CX7M
computers: first, the limited SFG-01 version,
then the improved SFG-05 version. With a little
adapter, the SFG-05 cartridge can also be
inserted in a slot cartridge of another MSX
The FM sound Synthesizer is built around the YM2151
or YM2164 sound chip. These IC's have 4 operators
and are for example used in the cheaper Yamaha DX
series (e.g. the DX-9, FB-01), several arcade
games and the Korg DS-8 and 707.
This unit includes a D/A converter (YM3012), so 8
audio tone signals can be obtained at the right
and left channels. It has also a YM2148 chip with
MIDI function and keyboard scan function.
This part of the audio mixer shows only the
FM part of the SFG cartridge. If the MIDI part is
used, then it will be displayed in the MIDI part
of the audio mixer.
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