Finally fixed it

Current_RAM_Data_Ptr = ti.pixelShadow
macro ramdata name, amount
    postpone
        name:=Current_RAM_Data_Ptr
        Current_RAM_Data_Ptr = Current_RAM_Data_Ptr + amount
        assert (Current_RAM_Data_Ptr + amount - ti.pixelShadow) < 69090
    end postpone
end macro