Questions tagged [dma]

Use this tag for questions regarding the use DMA (direct memory access) in historical computers or the history of DMA itself. DMA allows peripherals to access memory directly without using the main processor.

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What is the exact bus protocol used by the C64/C128 REU?

The Commodore 64/128 RAM Expansion Units used a DMA controller to move data between the REU's RAM and system RAM (or I/O space). One would set the addreses, length and direction for the transfer (or ...
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2answers
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what is DMA and how does it work?

I've heard the term 'DMA' being used a lot in reference to older consoles. My very basic understanding is that it's a way for the console to access memory directly. But directly as apposed to what? ...