BIOS and Chipset doubt

Some computers like smaller ones have the code right on the CPU. So your question may be a thing of the past soon as we move towards what is called System On a Chip or SOC. There's a lot on the web on this but don't think that the architecture is fixed.
Bob

just have different functions. BIOS is the Basic In and Out System, it's a software program loaded into a CMOS or Complementary metal-oxide semiconductor, which latter is a "chip". The term "chipset" however, since all motherboards usually have a CMOS (even if Mac calls it something else) usually refers to the controller chips on the motherboard, which direct traffic around it between CPU and RAM and the Peripherals. Typically they are also called bridge chips, as in North Bridge and South Bridge. That's enough to point you in the directions to research more yourself.

that is used to Boot you machine interact with components disk drives, video cards and USB ports. The firmware is flashed to the hardware to accomplish this. Chipset are the components in the integrated circuits that control the data flow between processor, memory and peripherals.

SO basically BIOS tells the OS/machine how to interact with components or how to use the components and the Chipsets are the circuitry that sends data to the components. So when you say to copy data from a Disk to a external USB drive. The data passes thru the circuitry to do this.