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for Watcom


Eliminate DOS Memory Limitations
for 32-bit Programs!

DOS/4G from Tenberry Software is the most widely used 32-bit DOS extender, designed to allow 32-bit DOS programs to eliminate the inherent DOS 640KB memory limit by addressing all the memory on Intel 386 and above machines in MS-DOS, PC-DOS, DR-DOS, the DOS boxes of OS/2, Windows, Windows NT and Windows 95 and DOS clones.

Special versions are available for Watcom or 16-bit developers.

Break the DOS 640KB barrier -- Unleash Your 32-bit Programs!

You can develop and run BIG programs -- up to 64MB. The programs you build with DOS/4G can have up to 64 MB of code and data.

Your programs will use almost no DOS memory -- only 24KB. With DOS/4G, your program will occupy only 24 KB of low memory (5KB more in some configurations). That leaves almost all of DOS's 640 KB free for other programs, and means that your program will run in any configuration, no matter how many network drivers, TSR's, etc. your users have.

You can develop DLLs and TSR's that have no memory limits. Develop high-performance, protected-mode executables, DLLs and TSR's without regard to the memory limitations of DOS. The DOS/4G architecture lets you control the hardware as easily and efficiently as you can in real mode. The API lets you take advantage of superior protected-mode interrupt and memory management -- ideal for both systems and applications.

Your programs have full access to all hardware. Your programs can issue any I/O instruction and have access to all of the machine -- the direct access that makes DOS programs so fast! (Not available in NT or OS/2 DOS boxes.)

Port your application in four hours (or less). Not only does DOS/4G support the most popular 32-bit compilers, but most libraries (including the ones that you may be using now) have a DOS/4G version available. As a result, DOS/4G runs most real-mode programs with no or small changes. Porting may be as simple as relinking and binding in the protected-mode loader. And if your code doesn't run on the first try, give our development staff a call. We know how to get you up and running quickly.

Your application is guaranteed to run -- any DOS, any machine. DOS/4G is based on DOS/16M, the most widely used DOS extender you can buy. Because so many popular programs -- Lotus 1-2-3, for example -- use it, all new hardware and systems software must be compatible with it. Develop your program with DOS/4G and you'll run on everything from 80386's to Pentiums, under Windows' and OS/2's "DOS boxes" or DR-DOS, with XMS, VCPI, or DPMI, and even on many Japanese non-AT-compatibles.

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Last modified 2003.4.8. Your questions, comments, and feedback are welcome.