Yamaha YMF278
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The Yamaha YMF278 or YMF278B, also known as the OPL4, is a sound chip that incorporates both FM synthesis and sample-based synthesis by Yamaha.
A YMF278B-F sound chip on a Yamaha Sound Edge SW20 PC card (near top left)
Static random-access memory
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Static random-access memory is a type of random-access memory that uses latching circuitry to store each bit. SRAM is volatile memory; data is lost when power is removed.
A static RAM chip from a Nintendo Entertainment System clone (2K × 8 bits)
Imaged by scanning electron microscope; cell topology is clearly visible
Imaged by optical microscope