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- Newsgroups: comp.sys.ibm.pc.hardware
- Path: sparky!uunet!mcsun!news.funet.fi!funic!nntp.hut.fi!nntp!veikko
- From: veikko@vipunen.hut.fi (Vesa J Pyyluoma)
- Subject: Re: What does a 16450 do for me?
- In-Reply-To: thomas@datamark.co.nz's message of Wed, 02 Sep 1992 02:33:16 GMT
- Message-ID: <VEIKKO.92Sep2150310@vipunen.hut.fi>
- Sender: usenet@nntp.hut.fi (Usenet pseudouser id)
- Nntp-Posting-Host: vipunen.hut.fi
- Organization: Helsinki University of Technology, Finland
- References: <1992Sep02.023316.39979@datamark.co.nz>
- Date: 2 Sep 92 15:03:10
- Lines: 29
-
- In article <1992Sep02.023316.39979@datamark.co.nz> thomas@datamark.co.nz (Thomas Beagle) writes:
-
- > Hi, I just found an old machine lying around the place that has a dual
- > serial card in it with a 16450 chip driving them both.
-
- > Now, I know that a 16550 is useful because it has buffers and shit,
- > but does a 16450 have anything similar?
-
- You're a proud owner of a turbo-charged 8250 (read: the original PC
- UART). The chip can cope with speeds up to 115K bps, theoretically.
- The question is whether your host PC can take such high data rates.
- Under Windows? Nahh. Because the 16450 can set all the IRQs it
- desires and Windows will happily ignore its requests and go on
- processing mouse messages or whatever. Meanwhile without the
- FIFO (that 16550A has) data will come in from one end and proceed
- promptly out from the other. That spells lost characters -> bad
- connection.
-
- If you wish to use a high-speed serial link in a DOS session (say, 38
- or 57K to a LAN server or another PC), you're into a winner. Otherwise,
- nothing much. Methinks.
-
- cheers,
- Vesa
-
-
- --
- Cooper: Who's the lady with the log?
- Truman: Oh, we call her the Log Lady.
-