Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!samsung!brutus.cs.uiuc.edu!lll-winken!sun-barr!decwrl!amdcad!diablo!phil From: phil@diablo.amd.com (Phil Ngai) Newsgroups: comp.sys.ibm.pc Subject: Re: DMA controller chip error Keywords: Fastback, DMA Message-ID: <28185@amdcad.AMD.COM> Date: 29 Nov 89 20:20:06 GMT References: <941@ac.dal.ca> <3686@orion.cf.uci.edu> <566@bmers58.UUCP> Sender: news@amdcad.AMD.COM Reply-To: phil@diablo.AMD.COM (Phil Ngai) Organization: Advanced Micro Devices, Inc. Sunnyvale CA Lines: 20 In article <566@bmers58.UUCP> mlord@bmers58.UUCP (Mark Lord) writes: |In article zeeff@b-tech.ann-arbor.mi.us (Jon Zeeff) writes: |>Not on an AT. The AT just doesn't have the hardware needed to do dma |>from the hard disk. | |Garbage. | |The IBM PC, XT, and AT models all have DMA hardware |specifically for this purpose, as do virtually all |clones of any of these computers. A little knowlege is a dangerous thing. Yes ATs have DMA hardware. No, ATs don't use DMA on their hard disks. Actually Jon is completely correct in that although ATs do have DMA hardware, it is not hooked up to the hard disks and the statement "AT doesn't have hardware to do DMA from hard disk" is correct. -- Phil Ngai, phil@diablo.amd.com {uunet,decwrl,ucbvax}!amdcad!phil AT&T Unix System V.4: Berkeley Unix for 386 PCs!