INT 62 u - FGDRIVER v3.03 - "FG_GETLINES" - GET TEXT ROWS FOR CURR VIDEO MODE
        AX = 003Bh
Return: AX = number of text rows on screen in current video mode
Note:   For FGDRIVER v1.10, this function was unused;"FG_GETLINES" was AX=0010h
SeeAlso: AX=0092h,AX=00A2h

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