Most modern microprocessors and microcontrollers use a single-phase clock. This technique is used in most modern microprocessors, microcontrollers, and DSPs. The MOSFET led to the development of microprocessors, memory chips, and digital telecommunication circuits. Chipsets are usually designed to work with a specific family of microprocessors. AMD Athlon X4 is a series of budget AMD microprocessors for personal computers. AMD FX is a series of AMD microprocessors for personal computers. Bus multiplexing requires fewer wires, which reduces costs in many early microprocessors and DRAM chips. The Intel Pentium brand refers to mainstream x86-architecture microprocessors from Intel. Ninety-eight percent of all microprocessors manufactured are used in embedded systems. Arduino board designs use a variety of microprocessors and controllers. Intel had introduced the first x86 microprocessors in 1978. It was built to be paired with the Intel 8088 or 8086 microprocessors. MIPS III was eventually implemented by a number of embedded microprocessors. Linolex based its technology on microprocessors, floppy drives and software. This article describes the calling conventions used when programming x86 architecture microprocessors.