S&H Computer Systems, Inc. - Makes TSX-32 general purpose, multiuser, multitasking, text-based, non-graphical, DOS compatible RTOS, coded for x86 platforms. Supports realtime use, embedded devices.
Concurrent Controls, Inc. - Makes, sells, supports Multiuser DOS, Concurrent DOS; helps businesses and VARs do more with less.
Multiuser DOS - Growing article, with links to many related topics. Wikipedia.
On Time Informatik GmbH - Makes, sells, supports RTKernel, realtime multitasking system for DOS; compact (about 16k code, 6k data); gives programmers the basic tools needed to develop efficient realtime software. No royalty.
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