They have no virtual memory support, don't have direct access to the computer's RAM, and have extremely limited interrupt support.
它们没有虚拟内存的支持，不能直接访问计算机的RAM，中断支持也非常有限。
All UNIX operating systems support a system of virtual memory (VM).
所有unix操作系统都支持某种虚拟内存(VM)系统。
Windows 3.0 introduced a host of new features: Program Manager, Solitaire, support for VGA and virtual memory, and a new "3d" look.
Windows 3.0引入大量新功能：程序管理器，纸牌小游戏，支持VGA和虚拟内存，以及一个更有立体感的外观。
On the extreme end, ports like uClinux and ELKS target processors that are "too small" for regular Linux; in particular, systems without a memory-management unit that can support virtual memory.
具体来说，系统没有一个可以支持虚拟内存的内存管理单元。
On the extreme end, ports like uClinux and ELKS target processors that are "too small" for regular Linux; in particular, systems without a memory-management unit that can support virtual memory.
具体来说，系统没有一个可以支持虚拟内存的内存管理单元。
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