You can't enjoy retro games without digging the music, and a YouTube video (below) shows exactly how those tunes evolved. As explained by the 8-Bit Guy and Obsolete Geek, early PCs and Apple machines used "beeper speakers" that were driven strictly by your computer's CPU. Those only produced crude sounds, because forcing the CPU to do more actually hurt gameplay. Computers and consoles eventually got dedicated sound chips, but each used a different number of "voices," producing the distinctive differences between, say, a Nintendo NES and a Commodore 64 system.
Source: The 8-bit Guy
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