The PC87310 incorporates two full function UARTs a floppy disk controller (FDC) with analog data separator one parallel port game port decode hard disk controller decode standard XT AT address decoding for on-chip functions and a Configuration Register in one chip Thus it offers a single chip solution to the most commonly used IBM PC XT and AT peripherals The floppy disk controller is fully compatible with the industry standard 765 architecture but it includes many more advanced options such as a high performance data separator extended track range to 4096 implied seek command scan command and both standard IBM formats as well as ISO 3 5 formats The UARTs are compatible with either the INS8250N-B or the NS16450 The parallel port hard disk select and game port select logic maintain complete compatibility with the IBM XT and AT Hardware selects XT or AT compatibility The Configuration Register is one byte wide and can be programmed via hardware or software Through its control the user can assign standard AT addresses and disable any major on-chip function (e g the FDC either UART or the parallel port) independently of the others This allows for flexibility in system configuration when adapter cards contain duplicate functions