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Simtel MSDOS 1992 June
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SIMTEL_0692.cdr
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sysutl
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16550a.arc
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16550A.DOC
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Text File
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1988-10-22
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2KB
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33 lines
16550A - A utility for toggling the NS16550A FIFO buffer
by Jon Schneider and Rick Petersen
re-written by Michael Schuster
USAGE: 16550A [1-4] [ON/OFF/?]
Where '1' thru '4' is the COM port; 'ON' or 'OFF' will toggle the
FIFO buffer's state, and '?' will simply show its status.
WARNING: Turning on the buffered mode may lock up your system,
make your COM: port 'disappear', or cause other strange errors when
using software that cannot handle buffered I/O properly.
This program is a re-write of 16550.EXE by Jon Schneider and
Rick Petersen. Its purpose is to toggle the FIFO buffer on
the NS16550A advanced UART chip. Activating this buffer makes
it possible to support serial communications at high baud
rates (e.g. 19,200) on slower PC's, or on faster PC's while
running multitasking operating systems or hardware that can
cause interrupts to be lost (e.g. Perstor hard disk controllers).
The original 16550.EXE did the job, but when toggling the buffer it
did not report on what it had done. I have added a routine to
display the status of the buffer and name the COM: port for which
the toggle had been requested.
Michael Schuster
CompuServe : [70346,1745]
Delphi, GEnie, MCI Mail: MSCHUSTER
UUCP : ...!cucard!dasys1!schuster