X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 10 - pcjr video

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INT 10 - PCjr VIDEO - CRT/CPU PAGE REGISTERS
        AH = 05h
        AL =
            80h read CRT/CPU page registers
            81h set CPU page register
                BL = new page register value
            82h set CRT page register
                BH = new page register value
            83h set both display registers
                BL = new CPU page register
                BH = new CRT page register
Return: BH = CRT page register
        BL = CPU page register

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