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Everything about Tenberry Software
Phoenix software company, developer of DOS/4GW and DOS/4G protected-mode extenders
Tenberry Software, formerly Rational Systems, was a software company based in Phoenix, Arizona, best known for developing DOS/4G and DOS/4GW, DOS extenders that became a de facto standard for running 32-bit software under 16-bit MS-DOS in the early 1990s. The company also developed DOS/16M, an earlier extender that enabled 16-bit applications to access extended memory beyond the conventional 640 KB limit. Wikipedia →
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