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- Path: sunrise.gv.ssi1.com!oronet!news
- From: estarry@oro.net (Ed Starry)
- Newsgroups: comp.dcom.modems
- Subject: Re: UART 16650
- Date: Mon, 26 Feb 1996 03:02:35 GMT
- Organization: "oronet, Penn Valley, CA"
- Message-ID: <4gr846$8ms@hg.oro.net>
- References: <31214F47.1FFC@ozemail.com.au> <4fsr22$4o1@centurio.m30x.nbg.scn.de> <4gf6b3$v5d@mips.pfalz.de> <4gkaj5$i5f@hg.oro.net> <312fc52d.11982224@204.248.93.100>
- NNTP-Posting-Host: @estarry.oro.net
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-
- shappel@accessus.net (Scott Happel) wrote about {Re: UART 16650} in
- 'comp.dcom.modems'...
- ~>
- ~> These large FIFO buffer sizes and we still have to suffer with everyone
- ~>using an 8250 for uploading. Who cares how big a Rx Buffer is if no one will
- ~>use these big FIFO buffers to Tx/Upload with!
- ~>
- ~> Ed...
- ~>
- ~Ed, I really don't follow your comment...Are you suggesting that a buffered uart
- ~is not helpful? I must be misunderstanding your message, because that is crazy!
- ===========================
-
- A buffered UART is useful for downloading but it's 'also' useful for
- uploading/Tx'ing/sending or whatever you wish to call it. Most, if not all,
- modems upload at a 8250 UART rate, 1 byte per IRQ. These FIFO Buffers can
- and should be used for uploading, yet no one does. This is the method you
- have to use if you want to reach the advertised DTE transfer rate of your
- modem. Uploading 16 bytes per IRQ gets things moving right smartly.
-
- You may have a 16-32-64 byte FIFO Buffer for downloading but if you only
- receive data at a 1 byte rate you're not gaining much are you? I'm simply
- complaining about the waste because no one uses the other half of the UART.
- Everyone concerns themselves with downloading and they tend to forget
- someone has to upload this junk.
-
- Ed...
-
-