NSC 8250

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NS 8250 in 40-pin DIL housing
Pin assignment of the NS 8250

The NSC 8250 from National Semiconductor (NS) was the UART provided in the IBM Personal Computer standard design for implementing asynchronous data transmission over the RS-232 interface. Pin-compatible successors are the NS 16450 and NS 16550 , which were used in the IBM Personal Computer / AT .

Some PC manufacturers deviated from its use and instead used the slightly incompatible Intel 8251 .

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