INT 62 u - FGDRIVER v1.10 - "FG_GETDACS" - GET VIDEO DAC CONTENTS
        AX = 00A4h
        CX = number of DAC registers to return (0001h to 0100h)
        DX = starting DAC register number (0000h to 00FFh)
        ES:BX -> buffer for DAC red/green/blue triples
Note:   the register number wraps back to zero after FFh
SeeAlso: AX=00A5h