PC NTMMTA: No Limitations on Memory Management

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Some of the memory management limitations of OS/2 1.x are removed. The most important of these is the limit of 16 MB of physical RAM. The OS/2 subsystem uses the large memory capability of Windows NT. As a result, you get an increase in performance, and the applications can use the additional memory.

Protection Model

The OS/2 subsystem implements protection between OS/2 applications. It constructs their address spaces (both the flat address space and LDTs) and implements the same protection as in OS/2.

Segment Swapping

The OS/2 subsystem uses the Windows NT paging mechanism; no segment swapping is performed. Paging works better than segment swapping, and it exists in OS/2 only to support the 80286 processor, which is not supported in Windows NT.