software for ms-dos or microsoft windows which originally ran on the 16-bit intel 8088 and 80286 microprocessors. these used a segmented address sp-ce to extend the range of addresses from what is possible with just a 16-bit address. programs with more than 64 kilobytes of code or data therefore had to waste time switching between segments. furthermore, programming with segments is more involved than programming in a flat address sp-ce, giving rise to warts like memory models in c and c++.
compare 32-bit application.
national semiconductor 16000
hardware a uart with a one-byte fifo buffer. the 16450 is a higher speed, fixed version of the 8250. it was superseded by the 16550. the 16450 was used for the ibm pc at and ps/2 but will not work in a ibm pc xt. (2004-03-21)
hardware a version of the 16450 uart with a 16-byte fifo. superseded by the 16550a. this chip might not operate correctly with all software. the 16c550 is a cmos version. (2004-03-24)
hardware a version of the 16550a uart with a 32-byte fifo. superseded by the 16750c. (2003-07-05)
hardware a uart with a 64-byte fifo. the 16c750 is a cmos version. [is there a 16750 (with no “c” on the end)?] (2004-03-24)