Re: (PMOD) Emachines/Etowers

Ed Schulz (edschulz@lucent.com)
Thu, 24 Jun 1999 16:24:30 -0400

Don Lashier wrote:
>
> It *does* matter what the UART is reported as. All internal modems
> (winmodems or not) use a "virtual" UART. There is simply no reason
> to convert to serial and back to communicate with a card on the
> computer bus. But it does matter that the UART reports itself as
> an 8250 or 16550 because if it reports itself as an 8250 the OS
> will think that there is no FIFO buffer present and performance
> will suffer.

To a DOS application running on Windows, our Lucent Win Modem appears as a
16550 UART. It's only in some Windows OS configurations that the Modems |
Diagnostics | More Info display shows 8250. (We recently fixed this for
ACPI systems.) I challenge anyone to demonstrate that performance suffers
because of the "8250" display. Windows applications do not interact with
the modem driver (or serial driver, for that matter) at the UART level.

-- 
Ed Schulz
edschulz@lucent.com
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