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BrightLight
 Post subject: Re: Does 486 IDE ISA drivers support DMA?
PostPosted: Mon Mar 12, 2018 7:52 am 
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PCI IDE supports two ATA channels with DMA. The old ISA PCs you talk about only have two ATA channels that can only use PIO.

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Octocontrabass
 Post subject: Re: Does 486 IDE ISA drivers support DMA?
PostPosted: Mon Mar 12, 2018 9:19 am 
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There are some ISA ATA adapters with DMA capability (such as this one), but those are very rare and not compatible with PCI DMA. Most ISA ATA adapters don't support DMA at all.
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