Xref: utzoo comp.binaries.ibm.pc.d:702 comp.sys.ibm.pc:18020
Path: utzoo!utgpu!attcan!uunet!husc6!cmcl2!rutgers!ucsd!ucbvax!hplabs!nsc!stevew
From: stevew@nsc.nsc.com (Steve Wilson)
Newsgroups: comp.binaries.ibm.pc.d,comp.sys.ibm.pc
Subject: Re: Using the DMA Controller in PCs and ATs.
Keywords: Intel 8237 DMA controller
Message-ID: <5552@nsc.nsc.com>
Date: 10 Aug 88 21:18:27 GMT
References: <2988@nicmad.UUCP> <6240@chinet.chi.il.us> <8159@watdragon.waterloo.edu> <8166@watdragon.waterloo.edu> <1626@spdcc.COM>
Reply-To: stevew@nsc.UUCP (Steve Wilson)
Organization: National Semiconductor, Sunnyvale
Lines: 18

In article <1626@spdcc.COM> eli@spdcc.COM (Steve Elias) writes:
>beware:  8237s manufactured by AMD under license from Intel have
>problems.  chips marked with a date code "82" or "83" are likely
>to be bad.  the problem only shows up when the PC tries to use more
>than one DMA channel at a time.

You may be correct about the problem with AMD 8237's and you 
may be correct about the date codes, etc.  HOWEVER, as I recall
the DMA controller in question was originally called the 9517 and
was designed by AMD.  It latter got picked up and 2nd source by
Intel. At least 4 years ago when I used the device in a design
I consulted the AMD data book and found the device listed as an
8237 AND under the 9517 in a different section of the manual.

Steve Wilson
National Semiconductor

[The opinions stated above are mine not those of my employer]