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]