Now let's zoom in on a few of the motherboard's other important chips. The C64's CPU, the MOS 6510 (the longest black chip in this photo) is a marginally improved 6502 CPU, but it runs at a painfully slow 1 MHz.
The best-known of the Commodore 64's chips these days is probably the 6581 SID
synthesizer chip (center of photo), which creates the tinny, raspy sounds that people can't get enough of
. In the 80s, the SID (short for "Sound Interface Device") was the most advanced sound-generating chip of its kind, and musicians everywhere still prize the SID's low-fi retro sounds.