Sphere was a small startup company and had difficulties delivering all of the products they announced. They filed for a Chapter 11 bankruptcy in April 1977. The Altair 680B was popular but MITS focused most of the resources on their Altair 8800 computer system and they exited the hobby market in 1978. The Southwest Technical Products computer was the most successful 6800 based personal computer. Other companies, for instance, Smoke Signal Broadcasting (California), Gimix (Chicago), Midwest Scientific (Olathe, Kansas), and Helix Systems (Hazelwood, Missouri), started producing SWTPC 6800 bus compatible boards and complete systems. Technical Systems Consultants of West Lafayette, Indiana, supplied tape based software for the 6800 (and later 6809) based computers and, after disk systems became available, operating systems and disk software as well. The 8080 systems were far more popular than the 6800 ones.