Multi-user Dos Systems in the 20th century

The moving target of dos compatibility has left multi-user Dos a generation behind, and Digital Research out of business. Indeed Digital Research sold out to Novell, Inc., and Novell wrote the product line off. Novell, did however, turn the source code over to a couple of their leading OEM's who have continued to develop it. The European OEM, Intelligent Microsystems, Ltd >of England has been the most aggressive about upgrading Concurrent Dos. In 1994 IMS released IMS 7.1 and, after renaming the product and upgrading it to support Windows, rereleased it in 1995 under the name REAL/32 . Support for the product continues With the latest version appearing in January 1997 which is known as version 7.6. The system is particular suitable for low cost dos based point of sale / inventory control systems but also works for general purpose dos applications as well. It is marketed in the United States by Logan Industries, Inc.


My office computer

I have taken the multi-tasking/multi-user system pretty well to the limits with a 7 user system in my law office as follows:

  1. Pentium P-90 processor on Intel Zappa motherboard.
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  2. 128 megabytes RAM
  3. 1 Gig Western Digital primary hard Drive partitioned to logical C:, E:, F:,G:,H:, I:, & J:
  4. 1.2 Gig Western Digital Slave Drive Partitioned to D: & K:
  5. 2 Maxpeed multiplexing video cards providing support for up to 8 monitor/keyboard/workstations in addition to the main console.
  6. 3 ea. 17Inch Monitors and 4 ea. 14" monitors.
  7. 2 Hewlett Packard Laser printers (an HP4si and an HP4V )
  8. 1 old dot matrix printer.
  9. A fax modem.
  10. REAL/32 Operating system as distributed by Logan Industries, Inc.

With this system each user has 8 virtual Dos sessions and may load up to 8 dos applications both traditional Dos applications and DPMI compliant applications and also load Windows 3.1 or 3.11. Practically speaking the 128 megabytes of ram is the limiting factor on how much can be loaded. The ability to simply load Windows as yet another DOS application and multi-task it right along with your favorite collection of traditional DOS applications is a little mind boggling, but that is exactly who it works.

- - Updated 12/16/2012
- - Updated 04/25/2008
- - Updated 4/13/1997
- - Updated 2/8/01
- - Updated 03/21/2008