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- Path: mail2news.demon.co.uk!genesis.demon.co.uk
- From: Lawrence Kirby <fred@genesis.demon.co.uk>
- Newsgroups: comp.dcom.modems
- Subject: Re: Is UUCP is critical feature for Unix machine?
- Date: Tue, 16 Jan 96 20:34:04 GMT
- Organization: none
- Message-ID: <821824444snz@genesis.demon.co.uk>
- References: <4chrn4$nm2@usenety1.news.prodigy.com> <4ckopg$6iv@mips.pfalz.de> <4d10p3$dsm@usenety1.news.prodigy.com> <DL94wH.231@bokonon.ussinc.com>
- Reply-To: fred@genesis.demon.co.uk
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-
- In article <DL94wH.231@bokonon.ussinc.com>
- stephen@bokonon.ussinc.com "Stephen M. Dunn" writes:
-
- > It depends, to a large extent, on the hardware. If you can
- >guarantee that you'll never lose a character on links between the
- >modems and their respective serial ports, great. I'm not quite that
- >trusting in general.
-
- Right. The system I have here is a P90 with 16550A UARTs, the software
- (running under plain DOS 6.22) sets the trigger level to 4. I still see
- overruns when there is serial transfer over heavy disk activity, probably
- due to SMARTDRV or the EIDE drivers in the BIOS.
-
- OTOH systems with 'intelligent' serial ports and automatic hardware
- flow control should be able to guarantee no character loss.
-
- > In the special case of a standard PC serial port, even with a
- >16550, I get a little worried in expecting it to be perfectly
- >loss-free. I've seen some (albeit somewhat underpowered - I'm
- >talking 386/40) systems which, even with a 16550 and a 16550-aware
- >OS (Xenix 2.3.4), would lose data at 38.4 kbps.
-
- You probably need to lower the trigger level.
-
- --
- -----------------------------------------
- Lawrence Kirby | fred@genesis.demon.co.uk
- Wilts, England | 70734.126@compuserve.com
- -----------------------------------------
-