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IBM PC Dos-Compatible Multi-Tasking Operating System Disclosure Number: IPCOM000039985D
Original Publication Date: 1987-Sep-01
Included in the Prior Art Database: 2005-Feb-01

Publishing Venue


Related People

Graham, CS Gregg, LE Sheppard, FP [+details]


This system allows the performance of a variety of related, but independent, operations, such as serving as a display station, a system printer and handling communications, for example. The system uses an IBM PC (disk operating system (DOS)) program for program preparation and execution. The system, called the PC Attachment Program (PCAP), allows multi-tasking with DOS compatibility, without the requirement to provide code which emulates large pieces of DOS. In this system, DOS is treated as just one of the many tasks running in the system. PCAP is not built on top of DOS; instead, it is independent of DOS (see Fig. 1). In this system there is the restriction that only the task specifically assigned to DOS can utilize the DOS functions.