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- Path: sparky!uunet!gatech!rutgers!faatcrl!iecc!Postmaster
- From: johnl@iecc.cambridge.ma.us (John R. Levine)
- Newsgroups: comp.unix.sysv386
- Subject: Re: Loosing incoming serial characters [summary]
- Message-ID: <9209052336.AA25239@iecc.cambridge.ma.us>
- Date: 6 Sep 92 03:36:04 GMT
- References: <JOCHEN.92Sep5145619@busybit.mrz.sub.org>
- Sender: Postmaster@iecc.cambridge.ma.us
- Organization: I.E.C.C.
- Lines: 26
-
- In article <JOCHEN.92Sep5145619@busybit.mrz.sub.org> you write:
- >Some weeks ago I wrote about problems, loosing incoming characters on
- >my dumb serial port. I got many replies from people with similar
- >problems, ...
- > My system looses incoming serial characters at speeds >2400bps
- > even with fas and 16550 chips. ...
- > With uucp and V32bis connections I get 1300cps on outbound
- > traffic, but only 800cps on inbound traffic. ...
- > My floppy is slow and sometimes I get floppy I/O-errors when
- > there is activity on the hard disk.
- > [ and in each case]
- > I have SCSI-disks with busmaster dma hostadapter (like adaptec 1542)
-
- That's strange. I have an Adaptec 1542B and serial ports with 16550A's
- running at 19.2K. I get about 1100 cps uucp over a Telebit (which is
- about as fast as they go) and reliable send and recieve with a dumb fax
- modem which is very unforgiving about lost characters, even when cranking
- the two SCSI disks as hard as I can. I set BUSON to 7us and BUSOFF to 4us.
-
- Maybe you have a cruddy motherboard. I used to have the ubiquitous Intel
- 386/25 motherboard (the board is built by Intel, but the CPU is the only
- Intel chip on it!) and have since upgraded to an EISA 486/25. On neither
- one did I have any overrun problems.
-
- Regards,
- John Levine, johnl@iecc.cambridge.ma.us, {spdcc|ima|world}!iecc!johnl
-