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Retrieved from ” https: Interfaces are listed by their speed in the roughly ascending order, so the interface at the end of each section should be the fastest. The corrected 1655a0 version was released in by National Semiconductor.
UART – Wikipedia
The A F version was a must-have to use modems with a data transmit rate of baud. Views Read Edit View history. The current version since by Texas Instruments which bought National Semiconductor is called the D.
This generated high rates of interrupts as transfer speeds increased. Pages using web citations with no URL.
Similarly numbered devices, with varying levels of compatibility with the original National Semiconductor part, are made by other manufacturers. At speeds higher than baudowners discovered that the serial ports of the computers were not able to handle a continuous flow of data without losing characters.
To 16550z these shortcomings, the series UARTs incorporated a byte FIFO buffer with a programmable interrupt trigger of 1, 4, 8, or 14 bytes.
More critically, with only a 1-byte buffer there is a genuine risk that a received byte will be overwritten if interrupt service delays occur. This page was last edited on 28 Novemberat National Semiconductor datashert released the A which corrected this issue.
The A and newer is pin compatible with the The original had a bug that prevented this FIFO from being used. The also incorporates a transmit FIFO, though this feature is less critical as 16550q in interrupt service would only result in sub-optimal transmission speeds and not actual data loss.
Exchange of the having only a one-byte received data buffer with aand occasionally patching or setting system software to be aware of the FIFO feature of the new chip, improved the reliability and stability of high-speed connections.