home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!uunet.ca!xenitec!zswamp!geoff
- From: geoff@zswamp.UUCP (Geoffrey Welsh)
- Newsgroups: comp.dcom.modems
- Subject: Re: Help on upgrade to 16550A UART
- Message-ID: <B23DoB3w164w@zswamp.UUCP>
- Date: Thu, 23 Jul 92 19:56:46 EDT
- References: <711674982snx@n5ial.chi.il.us>
- Organization: Izot's Swamp
- Lines: 25
-
- jim@n5ial.chi.il.us (Jim Graham) writes:
-
- > of course, good
- > luck getting UART identifying software to know the difference....from
- > the programs I've seen, a visual of the chip is the only truly reliable
- > way to know what you've got.
-
- To the contrary, in my experience... there are chips labelled "8250" which
- are functionally identical to the 16450 (including such trivia as the scratch
- register). I suspect - but have no proof - that NS doesn't make 'real' 8250s
- anymore, but ships 16450s labelled 8250 because that's what people order.
-
- > see my previous post for more details, but there also seems to be a
- > very substantial difference between the clones and the real chips from
- > National Semiconductor (is this *REALLY* news to anyone?.....), so it
- > is quite possible that every person in this discussion could be
- > right, wrong, and somewhere in between, depending on which vendor's
- > chip each person is using.
-
- You mean with 16550 chips? Yes. I've seen 'clones' from a couple of
- vendors, and each has not worked well for me. Then again, my last batch of
- NS 16550s (labelled PC16550N, not NS16550AFN) caused trouble, too.
-
- Geoffrey Welsh, 7 Strath Humber Court, Islington, Ontario, M9A 4C8 Canada
- geoff@zswamp.uucp, [xenitec.on.ca|m2xenix.psg.com]!zswamp!geoff (416)258-8467
-