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000299_news@newsmaster….columbia.edu _Thu Nov 20 04:08:48 1997.msg
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From: jwt@shrine.cyber.ad.jp (Jim Tittsler)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: How fast will a 16550 go?
Date: 20 Nov 1997 07:35:06 GMT
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On Wed, 19 Nov 1997 14:09:11 GMT, Jeffrey Hurwit <jhurwit@netcom.com> wrote:
>I would like to use MS-Kermit on two mahines connected by a null modem
>cable to transfer files. What is the maximum safe speed of a 16650 FIFO
>UART?
The National Semiconductor 16550 can take a clock input of up to 24MHz,
which given the /16 samples needed per baud means you could theoretically
do 1.5Mbaud using the internal baud rate divisor. Of course, you would
have to use different line drivers and cabling to achieve those speeds.
I've successfully replaced the 1.8432MHz crystal on some clone dual port
serial I/O cards using the Startech 16C552 with an 11.2896MHz crystal and a
16.93MHz oscillator (at different times) and run them at 100s of kilobaud,
but I used my own software where I could control the interrupt environment.
You could always try different crystals in your boards until you find the
maximum MS-Kermit and your machines can hack in your particular configuration.
Jim