When does Halt and Catch Fire return?

Halt and Catch Fire is an American period drama television series. It aired on the cable network AMC in the United States from June 1, 2014, to October 14, 2017, spanning four seasons and 40 episodes. It depicts a fictionalized insider's view of the personal computer revolution of the 1980s and the early days of the World Wide Web in the early 1990s. The show's title refers to computer machine code instruction that would cause the computer's central processing unit to cease meaningful operation (and in an exaggeration, catch fire)
Taking place over a period of more than ten years, Halt and Catch Fire depicts a fictionalized insider's view of the personal computer revolution of the 1980s and the early days of the World Wide Web in the early 1990s. The series begins in 1983, just as IBM is cornering the PC market with the IBM PC.