Mathematica is a system for doing mathematics with a computer.
Symbolic manipulation, graphing, high quality output, and
extensibility make this system a choice for physicists, engineers and
mathematicians - anyone who must speak math as their vocation's
principal language.

Mathematica 2.0, released in January 1991, was the first major update
of Mathematica.
It included many bugfixes and improvements ([link][1]):
? Numerical ordinary differential equation solver
? Numerical compiler
? Linear algebra improvements
? Implementation of Risch algorithm for Integrate
? Symbolic ordinary differential equation solver
? Series extended to many special functions
? ParametricPlot3D added
? Many extra embellishments for graphics
? Improved hidden-surface elimination for 3D graphics
? Many string and file operations
? MathLink protocol for interprocess and network-based communication
? Sound support
? Support of foreign character sets
? Error detection and debugging
? Notebook front end

Mathematica 2.1, released in June 1992, included improvements in:
? Upgrade of contour plotting algorithm
? Unix MathLink enhancements and documentation
? MathLink for Macintosh
? QuickTime animations for Macintosh version
? Support for Windows 3.1
? Unix and PC thin-version installation for reduced memory usage
? New packages added in areas such as nonlinear fitting, binary file
manipulation, Dirac delta functions, and sound synthesis

Mathematica 2.2, released in June 1993, was the last in the 2.x
series.
It included improvements in:
? Windows front end with new notebook commands
? Separate front end on Macintosh
? X front end
? MathLink for Windows
? Linux version
? Isocontour plotting routine added
? Package for symbolic solutions of first-order partial differential
equations added
? Ten other packages added in areas such as three-dimensional contour
plotting, variational calculus, and music
? New help features, including online manuals on X Windows and a
Function Browser on Macintosh and NeXT
? Faster numerical solutions of sparse linear systems of equations
? Symbolic definite integration expanded to include tests for
nonintegrable singularities and also handle branch cuts in the range
of integration

Macintosh 2.2 was the first native version released for the Power
Macintosh.
Mathematica 2.2.3 was the last version released for IBM OS/2 and DEC
OpenVMS ([link][2]).

The Manual Mathematica: A System for Doing Mathematics by Computer,
Second Edition is still available at the Publisher's website
([link][3]).

The 1st download is version 2.0 Enhanced.
The 2nd download is version 2.2.2.
The 3rd download is version 2.2.2 including MathLink Developer's Kit.
The 4th download is version 2.2.3 CD-ROM image for Unix (Sun Solaris
(SPARC), DEC OSF/1 AXP, HP-UX (HP 9000 Series 700), IBM AIX, SGI IRIX,
NeXT NeXTStep (68k, HP-PA, Intel), DEC VMS, DEC OpenVMS AXP).
The 5th download is a demonstration disk for version 2.0. The demo
consists of MathRead 2.0 (A view for Mathematica files) and several
example files that show the capabilities of Mathematica 2.0.

See also: [Mathematica 1][4], [Mathematica 3][5], [Mathematica 4][6],
[Mathematica 5][7].

Compatibility
Architecture: 68k PPC

v2.0:
Macintosh

v2.2:
Macintosh or Power Macintosh

v2.2.3:
IBM OS/2:
IBM OS/2 2.0 or higher
8 MB RAM (minimum) to 16 MB RAM (recommended)
10 MB hard disk space

DEC OpenVMS:
DEC OpenVMS 7.0
16 MB RAM (minimum) to 32 MB RAM (recommended)
21 MB hard disk space

(see also: [Wolfram - Technical Requirements - Mathematica v3.0.2][8])

  [1]: http://www.wolfram.com/mathematica/quick-revision-history.html
  [2]: https://web.archive.org/web/20001206090500/http://store.wolfram.com/catalog/mathematica/platforms.html
  [3]: http://reference.wolfram.com/legacy/v2/
  [4]: http://macintoshgarden.org/apps/mathematica-1
  [5]: http://macintoshgarden.org/apps/mathematica-3
  [6]: http://macintoshgarden.org/apps/mathematica-4
  [7]: http://macintoshgarden.org/apps/mathematica-5
  [8]: https://web.archive.org/web/19990117015110/http://store.wolfram.com/catalog/mathematica/platforms.html