ISA DMA: Difference between revisions

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ISA DMA (view source)

Revision as of 02:21, 3 April 2007

542 bytes removed ,  17 years ago
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''I've added the following to what was orignally here, some of it has been re-written a great deal of it has been written from personal experience at swearing at the little DMA chip or it's functional equivalent. Still more to come, there's a lot of thoery to understand before simply writing code. The DMA chip has a lot of 'interesting' and 'unexpected' features. Failing to take these into acount will result in nothing working. You have been warned :-). XARDFIR''
 
This page could use a rewrite. -Mystran 2007-04-02
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DMA in today's PC architecture is in many ways like an appendix. It is used by the floppy disk controller, ISA sound cards, ISA network cards and parallel ports (if they support ECP mode). Whilst interrupt, keyboard and timer interface circuits have obvious and relevant uses, the DMA controller and it's programming interface are still well and truly stuck in the 1970's where they were first designed. Modern PCI controllers typically have their own "bus mastering", which is far better.
 
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