DbDOS

dbDOS is software developed by dBase for Windows computers with Intel processors. dbDOS allows Intel-based PCs to run DOS Applications, such as dBASE III, dBASE IV (Version 1, 2, 3), and dBASE V for DOS in an emulated DOS environment. It is an environment configured specifically to allow the various versions of dBASE for DOS to run without any changes to the dBASE executables or the dBASE compiled programs created.
The company dBase offers licenses for dBase CLASSIC (DOS).
Overview.
In the late 1980s to early 1990s, dBase for DOS was one of the more popular database tools on the market. When Borland decided to stop development of the DOS version in favor of the Windows version, many companies were left providing support for themselves.
Many decided to keep their applications running on the DOS platform for many years following Borland's switch to Windows. This strategy worked well enough until Microsoft decided to make some changes in the way the underlying operating system worked. And as more and more PC started supporting 64-bit operating systems, the ability to keep dBASE for DOS running on maintainable hardware became difficult.
In 2012, the newly formed dBase LLC opted to support this install base of dBASE applications by releasing a virtualization tool named dbDOS. Based on the popular DOSBox, dbDOS quickly became an easy way to enable virtually any DOS-based application on Microsoft's Windows XP, Vista, Windows 7, Windows Server 2003 and Windows Server 2008, both 32- and 64-bit versions of the operating systems. With enhanced support for dBASE III, dBASE IV (Version 1, 2, 3), and dBASE V for DOS, dbDOS is the easiest way to keep mission critical applications up and running for years to come.
dbDOS 1.0 was released on May 23, 2012, following the restructuring of dBase LLC in April 2012.
System requirements.
The dbDOS virtual machine requires an Intel-based personal computer running Microsoft Windows. The computer must have at least 1 gigabyte of RAM and at least 100 megabytes of free hard drive space available.
Once the virtual machine software known as dbDOS is installed, the user is then free to install additional application software provide they have the originally licensed installation media available.
Features.
dBase dbDOS 1.1 was released as a free upgrade on June 22, 2012. New features in this release include:
dBase dbDOS 1.5 was released as a free upgrade on September 25, 2012. New features in this release include:
dBase dbDOS PRO 2 was released a new professional version on August 23, 2013. New features in this release include:
August 23, 2013 
dBase dbDOS PRO 3 was released on May 2, 2014. New features in this release include:
May 2, 2014
dBase dbDOS PRO 4 was released on May 6, 2015. New features in this release include:
May 6, 2014
dBase dbDOS PRO 4N was released on May 18, 2015. New features in this release include:
May 18, 2014
Architecture.
dBase dbDOS has a unique architecture.