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https://en.wikipedia.org/wiki/Direct_memory_access
Direct memory access (DMA) is a feature of computer systems that allows certain hardware subsystems to access main system memory (random-access memory), independent of the central processing unit (CPU).. Without DMA, when the CPU is using programmed input/output, it is typically fully occupied for the entire duration of the read or write operation, and is thus unavailable to perform other …
https://www.intel.com/Assets/PDF/whitepaper/318244.pdf
Master functionality. Instead, PCI/ISA bridges will implement the PC/PCI DMA and/or Distributed DMA specification to fulfill these transactions. As a result, it is necessary for the PCI controller to implement support for at least one of these specifications to facilitate …
https://en.wikipedia.org/wiki/ISA_DMA_controller
Intel 8237 is a direct memory access (DMA) controller, a part of the MCS 85 microprocessor family. It enables data transfer between memory and the I/O with reduced load on the system's main processor by providing the memory with control signals and memory address information during the DMA transfer.
http://www.flaterco.com/kb/ISA_chipsets.html
ISA chipsets for ATX motherboards. Last modified: Sun Jun 2 10:24:06 EDT 2019 In the PC System Design Guide (1997–2001), Intel and Microsoft made the case that ISA should be not merely deprecated, but completely eliminated. The reasons were "To improve system performance, reduce customer support costs, and ensure true ease of use in PC systems and peripherals."
https://adek.com/product/P4BWA
The P4BWA industrial motherboard is a long-life ATX motherboard with FOUR 32-bit PCI slots, 2 ISA slots, and 1 each PCIe x16 and PCIe x4 slots. This motherboard is Socket 775 for Intel Quad Core, Core 2 Duo, Pentium D, and Pentium 4 processors.
https://unix.stackexchange.com/questions/241978/what-is-proc-dma-is-it-just-for-legacy-support
The ISA dma controller is still included on any system that has an ISA bus, which your typical desktop system still has these days, mostly to support floppy disk and IDE disk controllers ( which AHCI SATA controllers can still emulate for backward software compatibility ).
https://docs.microsoft.com/en-us/windows-hardware/drivers/kernel/map-registers
In effect, map registers provide scatter/gather support for drivers that use DMA, regardless of whether their devices have scatter/gather capabilities. The following figure illustrates such a physical-to-logical address mapping for the driver of an ISA DMA device that does not have scatter/gather capabilities.
https://community.ig.com/forums/topic/5530-dma-for-shares-possible-in-an-isa/
Oct 15, 2018 · left me with the impression that DMA for share accounts would not involve buying actual shares but only trading in their underlying prices via CFDs (I understand some trading platforms offering 'DMA for shares' operate this way) and hence DMA would not be available in IG's self-select share ISA (since CFDs are not permitted in ISAs).Location: IG Group, Cannon Bridge House, 25 Dowgate Hill, London, EC4R 2YA
http://labmaster.com/products/faq/html/ssi_faq_dma_busmastering.html
Scientific Solutions ® Inc. On-Line Reference: ISA DMA vs. PCI BusMastering Both the ISA and the PCI bus have the ability to transfer data to/from computer memory without the intervention of …
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