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Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!news.mel.connect.com.au!munnari.OZ.AU!news.ecn.uoknor.edu!feed1.news.erols.com!howland.erols.net!newsfeed.internetmci.com!raven.eva.net!bighorn.accessnv.com!jca From: jca@bighorn.accessnv.com (J.C. Archambeau) Newsgroups: comp.unix.bsd.freebsd.misc Subject: Re: Problems with uucico Date: 13 Nov 1996 04:44:08 GMT Organization: Access Nevada Inc. Lines: 39 Message-ID: <56bjmo$b0a@raven.eva.net> References: <Pine.LNX.3.91.961023224820.1769C-100000@speedy.ruhr.de> <873eygia4e.fsf@acme1.ruhr.de> NNTP-Posting-Host: bighorn.accessnv.com X-Newsreader: TIN [version 1.2 PL2] Christoph Haas (chris@acme1.ruhr.de) wrote: : > (UMC8669F) : ok, now that i have checked my ASUS board again, it seems to me that : the "loosing sync on receive" problem does not only occur on boards : with that broken UMC chip. i have a winbond chip on my board and i : have the same problems that should only show up on UMC chips. now that : i can't use any external modems i installed an internal one that has a : uart of its own on board (no, it's not an asic. you can read 16c550 on : the chip) and the problem is back. it seems to be impossible to have a : working serial port, but i really don't know why. on my old board (a : noname 486) everything works fine again. i'm not sure whether this is : a hardware problem (again: ppp works fine on the ASUS thing) or a bug : in the sio driver or in taylor uucp. i will check it with 2.2-RELEASE : as soon as i can get it. maybe something has been fixed : allready... (sigh)... I'm more apt to believe that it's a broken UART. Back in the days when before Linux and FreeBSD we had the FAS driver for the commercial x86 Unix OSes written by a brilliant programmer whose name escapes me. There were a lot of broken UARTs that had the label 16550, but they weren't 16550's since the FIFO buffer was broken. The problem was so wide spread that I only bought and used guinine NS16550A(F)N UART chips. I still don't trust integrated ASICs on I/O cards that have everything on one chip. Unfortunately these days you don't really have much choice unless you go mail order or pick up a used I/O card with socketted 40-pin UARTs. The 16550 'compatable' UARTs are fine for serial mice since you don't need the FIFO (in fact, to get serial mice to work properly, you often have to disable it), but with respect to high speed modem transfers and serial links you do. It's difficult to tell nowadays which 16550 'compatable' UARTs work and which ones don't without some trial and error. You just have to do a hail sysadmin and hope it does work. -- /* ** Internet: jca@accessnv.com | Don't blame me, I didn't vote for Clinton. ** jca@anv.net */