X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 4b - virtual dma specification

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INT 4B - Virtual DMA Specification - ENABLE DMA TRANSLATION
        AX = 810Ch
        BX = DMA channel number
        DX = 0000h
Return: CF clear if successful
            ZF set if disable count decremented to zero
        CF set on error
            AL = error code (see AX=8102h)
SeeAlso: AX=810Bh

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