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- Path: vnetnews.value.net!usenet
- From: Davis' <davis@pbinet.com>
- Newsgroups: comp.dcom.modems
- Subject: Re: Better UARTs? ISDN? Parallel port Modem?
- Date: Sat, 24 Feb 1996 23:12:09 -0800
- Organization: Value Net Internetwork Services Inc.
- Message-ID: <31300BC9.1E46@pbinet.com>
- References: <4g0hq5$166u@usenetw1.news.prodigy.com> <DMwD08.34u@freenet.carleton.ca>
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-
- If you really care for a "better UART" then check out Hayes ESP serial
- card. http://www.hayes.com/espmulti.htm
-
- I have spoken to many skeptics and the conclusion seems to be that one
- of these would be required at each end of the connection to really reach
- the speeds that they claim. I have read good things about parallel port
- modems though. They do not have the basic limitations of the serial
- port. There is a modem that is parallel/serial and is upgradable to
- ISDN as well. Here is a review:
-
- http://www.cnet.com/Content/Reviews/Compare/Modems/pc21.html
-
- The ZyXel Elite is the only modem in this review to offer an ISDN
- option. By installing a card, you can get up to 128-kbps
- throughput--that is, provided you can afford an ISDN line (and can
- ersuade your phone company to install one). For more about these tricky
- issues, see ISDN: 56 kbps and beyond.
-
- The Elite is also one of only two modems we tested that include a
- parallel port, and it is the more appealing because it can be used in
- two ways. You can connect the parallel port to a printer to print faxes
- directly, without tying up the PC's processor, even when the PC is
- turned off. You can hook up the Elite to your PC's parallel port, which
- is fast enough to handle ISDN data rates even if your serial port
- doesn't have a 16550 UART. This makes the Elite particularly appealing
- to laptop owners who can't upgrade their ports. Despite some published
- claims to the contrary, 16550 UARTs are not a bottleneck to V.34
- performance.
-
- We found the Elite's bundled software quite difficult to learn, but it
- was one of the most capable packages we reviewed, combining the usual
- data and fax communications with a voice-mail menuing system that
- included a selection of prerecorded messages.
-
- Beyond these unique features, the ZyXel offers good performance, flash
- ROM for firmware upgrades, superior support options, and a nice
- five-year warranty.
-
- ZyXel; 714/693-0808, fax 714/693-8811,
- BBS 714/693-0762
- Street price: $425
- Warranty: five-year limited
- Data software: Trio Communications Suite 3.0 for Windows
- Fax software: Trio Communications Suite 3.0 for Windows
-
-
- Anthony Hill wrote:
- >
- > bill davidsen (davidsen@tmr.com) writes:
- > > I heard about the 16650 UART some time ago, which has 32 byte FIFOs
- > > rather than 16. While it sounded interesting, it also didn't seem
- > > like something I "just had to have." However, now I've seen some
- > > specs on the 16750 UART. Got to try one of these.
- > >
- > > It seems that in addition to a 64 byte FIFO (no surprise) it will do
- > > the hardware handshake for you! Now the slowest system around will
- > > not lose data because the UART will drop RTS when the FIFO is almost
- > > full, and will stop sending if the CTS drops. This is where the
- > > logic should have been all along, and all I want to know is where to
- > > find one.
- > >
- > > Any experience with these? The larger buffer is nice, but the flow
- > > control changes the whole dynamics of how UARTs are handled.
- >
- > Unless I'm mistaken the 16650 also is supposed to do hardware flow
- > control for you (although I've heard rumors that there were a few problems
- > with this part of it), although it doesn't do Xon/Xoff flow control which
- > the 16750 is supposed to be able to do as well as RTS/CTS. Of course,
- > there's still one slight problem. Someone's got to right the software to
- > properly support these UARTs before they'll be really useful. I've heard
- > of a few people writing software for teh 16650 (eg. I think SIO for OS/2
- > supports them), but I haven't heard of anything for the 16750 yet.
- >
- > Anthony
- >
- > --
- > Anthony Hill | an171@FreeNet.Carleton.CA
-