Does 486 IDE ISA drivers support DMA?

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BrightLight
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Re: Does 486 IDE ISA drivers support DMA?

Post by BrightLight »

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.
You know your OS is advanced when you stop using the Intel programming guide as a reference.
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Octocontrabass
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Re: Does 486 IDE ISA drivers support DMA?

Post by Octocontrabass »

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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