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The 8251 Universal Synchronous/Asynchronous Receiver/Transmitter packaged in a 28-pin DIP made by Intel. It is typically used for serial communication and was rated for 19.2 Kbits per second signalling rate.
It includes 5 sections
- read/write control logic
- data bus system
- modem control
- Mikrocomputer Bausteine, Datenbuch 1979/80,gullu Band 3, Peripherie, Siemens AG, Bestellnummer B 2049, pp. 64–101.
- NEC Electronics (Europe) GmbH, 1982 Catalog, pp. 631–648.