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2. Error detection and correction - Wikipedia

   en.wikipedia.org/wiki/Error_detection_and_correction

   A checksum of a message is a modular arithmetic sum of message code words of a fixed word length (e.g., byte values). The sum may be negated by means of a ones'-complement operation prior to transmission to detect unintentional all-zero messages. Checksum schemes include parity bits, check digits, and longitudinal redundancy checks.

3. List of Sinclair QL software - Wikipedia

   en.wikipedia.org/wiki/List_of_Sinclair_QL_software

   QL Cash Trader (Cash Accounting Package), RWAP Software QL Cosmos (Astronomy Program), Talent available from RWAP Software (Programmer: G. F. Cornwell) QL Gardener , GCS ( Sinclair )

4. Bit error rate - Wikipedia

   en.wikipedia.org/wiki/Bit_error_rate

   Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Pages for logged out editors learn more

5. Dennis Brothers - Wikipedia

   en.wikipedia.org/wiki/Dennis_Brothers

   They made their first motor vehicle in 1898, a De Dion-powered tricycle which they exhibited at the National Cycle Show, which they offered for sale, along with a quadricycle. [1] In 1899, the first Dennis car proper appeared, the Speed-King Light Doctors' Car, [ 1 ] a four-wheeler with a 3.5hp a rear-mounted de Dion engine and three-speed ...

6. Ward Leonard control - Wikipedia

   en.wikipedia.org/wiki/Ward_Leonard_control

   Ward Leonard control, also known as the Ward Leonard drive system, was a widely used DC motor speed control system introduced by Harry Ward Leonard in 1891. In the early 1900s, the control system of Ward Leonard was adopted by the U.S. Navy and also used in passenger lifts of large mines.