Nvidia Corp, Advanced Micro Devices Inc and other tech firms are scrambling to assess whether they must halt sales to units of China’s Inspur Group Ltd after its addition to a U.S. export blacklist last week. The United States last week added Inspur to its trade blacklist for allegedly acquiring U.S.-origin items in support of the China’s military modernization efforts. The listing means that companies cannot sell Inspur items like semiconductors, which are made with U.S. tools, unless they apply for and get licenses, which are likely to be denied.