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The MC143421 PCI Bus Interface chip is a low cost and highly integrated PCI interface solution that includes Advanced Configuration Power Interface (ACPI) features. It is designed to enable the addition of a PCI interface to PC peripherals such as DSP-based analog modems.
The Peripheral Interface Bus (PIB) that interfaces this device to the PC peripheral function provides four address lines, byte-wide data, and eight programmable lines that can be used for chip selects, interrupts, and power-down enable.