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  2. Direct memory access - Wikipedia

    en.wikipedia.org/wiki/Direct_memory_access

    Due to their lagging performance (1.6 MB/s maximum 8-bit transfer capability at 5 MHz, [4] but no more than 0.9 MB/s in the PC/XT and 1.6 MB/s for 16-bit transfers in the AT due to ISA bus overheads and other interference such as memory refresh interruptions [1]) and unavailability of any speed grades that would allow installation of direct ...