serial ports on the '286

[Rick Richardson]

In article <532 at micropen> dave at micropen (David F. Carlson) writes:
 
>> For example, let's suppose uPort modified the serial driver such that
>> when the line was put in raw mode, the 16550AN was set to generate an
>> interrupt every tenth character.  The interrupt handler would then get
 
>But raw mode is defined (often) to return in *less* than 10 characters.
>The "win" of the fifo is that overruns are nearly impossible, which allows
>the driver to make interrupt latency almost a non-issue.  Getting in and

But the 16550A will automatically timeout and generate the interrupt
for less than N characters if something is in the FIFO and it has
been idle (I think) 4 character times.






-- 
		Rick Richardson, PC Research, Inc.

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