Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!cs.utexas.edu!uunet!nuchat!steve
From: steve@nuchat.sccsi.com (Steve Nuchia)
Newsgroups: sci.electronics
Subject: Re: 16550
Keywords: 16550 UART interrupts
Message-ID: <1991May9.003258.17410@nuchat.sccsi.com>
Date: 9 May 91 00:32:58 GMT
References: <1991May6.171901.21249@magnus.acs.ohio-state.edu>
Organization: South Coast Computing Services, Inc.  Houston
Lines: 16

In article <1991May6.171901.21249@magnus.acs.ohio-state.edu> ahenden@magnus.acs.ohio-state.edu (Arne A Henden) writes:
>for extended periods of time.  Anyway, the 16550 works just
>fine in 16450 mode, but as soon as we put it in 550 mode it
>no longer creates interrupts.

This is true.  The 16550 ----> Does Not Work <----

Specify 16550A.  The current production plastic dip parts (last time I
bought a batch, anyway) are labelled NS16550AFN.  The A is critical,
without it you have junk.  Western Digital second-sources the non-A part,
but that doesn't help since they don't work.
-- 
Steve Nuchia	      South Coast Computing Services      (713) 964-2462
	"Innocence is a splendid thing, only it has the misfortune
	 not to keep very well and to be easily misled."
	    --- Immanuel Kant,  Groundwork of the Metaphysic of Morals