X-Hacker.org- Interrupts & Ports - get video ram address [tandy 1000]

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        GET VIDEO RAM ADDRESS [TANDY 1000]

        AH = 70h
Return: AX  = segment address of the following
        [BX] = offset address of green plane
        [CX] = segment address of green plane
        [DX] = segment address of red/blue plane
               (red offset = 0, blue offset = 4000)

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