NS16550A
features while maintaining software patibility These development paths have been brought together in a new UART from National Semiconductor designated the NS16550A The NS16550A has all of the registers of its two predecessor parts (INS8250 and NS16450) so it can run all existing IBM PC XT AT RT and patible serial port software In addition it has a programmable mode which incorporates new high-performance features
Of course all of these advanced features are useful in any asynchronous serial munications application regardless of the host architecture The reader is assumed to be familiar with the standard features of the NS16450 so this paper will concentrate mainly on the new features of the NS16550A If the reader is unfamiliar with these UARTs it is advisable to start by reading their data sheets The first section reviews some of the design considerations and the operation of the NS16550A advanced features
The second section shows an NS16550A initialization routine written in 80286...
