- Altos Computer Systems - acquired by Acer in 1990.
- Amdahl Corporation - Now subsumed into Fujitsu.
- Apricot Computers - ceased operations in 1999.
- AST Computers, LLC - Exited the computer market in 2001.
- Atari Corporation
- Austin Computer Systems
- Burroughs - merged into Unisys.
- Commodore International - declared bankruptcy in 1994.
- CompuAdd - filed for bankruptcy in 1993.
- Corona Data Systems - among the original "IBM PC Compatible" clone makers
- Eagle Computer - ceased operations in 1986.
- Elonex
- English Electric - merged into International Computers Limited.
- Everex - US subsidiary closed its doors in 2009.
- Evesham - merged into TIME Computers.
- Fountain Technologies - parent company of Quantex Microsystems filed for bankruptcy in 2000.
- Franklin Computer Corporation - exited computer hardware business and reorganized into Franklin Electronic Publishers.
- International Computers and Tabulators - merged into International Computers Limited.
- International Computers Limited - now part of Fujitsu.
- Kaypro - filed for bankruptcy in 1992.
- Leading Edge - Mid '80s leader in PC Clone for the masses - Manufacturing done first by Mitsubishi then Daewoo
- Magnuson Computer Systems - filed for bankruptcy in early 1980's.
- Mitsubishi Electronics - Closed computer systems division in 1990 Manufactured systems for Leading Edge and Sperry-Unisys
- MPC (formerly MicronPC)[1] - Filed Chapter 11 bankruptcy on November 7, 2008. Efforts at reorganization failed.
- NeXT - acquired by Apple Computer in 1996.
- Northgate Computers - Filed Chapter 11 bankruptcy in 1994, but the attempted reorganization was not successful.
- Osborne Computer Corporation
- PC Brand - acquired by Tandon Corporation in 1991.[2]
- Simply Computers - merged into Misco/Systemax.
- Sinclair Research - acquired by Amstrad in 1986.
- Sperry Univac - merged into Unisys.
- Tandy Corporation - Previous parent company of RadioShack, produced the TRS-80 and Tandy 1000 and 2000 IBM PC compatible computers. Sold their computer division to AST Computers in the early 1990s.
- Tiny Computers - merged into TIME Computers.
- Zepto Computers A/S - On 17 November 2009 Zepto Computer was declared bankrupt, after several tries to save the company[3].
- Zeos - merged into MPC Corporation in 1996, which in turn filed for Chapter 11 bankruptcy in 2008.
- RCA (Radio Corporation of America) no longer produces computers, but was significant competitor in the mainframe era.
- General Electric was another significant player in the mainframe era.
- Digital Equipment Corporation - bought out by Hewlett-Packard in 1998.
- PsyStar Corp.
- Wang Laboratories - acquired by Getronics in 1999.
- XByte Computers
- Xerox - still in business but no longer manufactures computers.
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