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yartinov писал(а): Есть ноут 486 проц

Theoretically, you only need 2MB of FAST-RAM and 1MB of CHIP-RAM. The 1MB CHIP-memory is only needed due to the way NetBSD is currently booted. The kernel is loaded into the CHIP-memory and then copied into the largest chunk of fast memory found. Therefore 2MB is the bare minimum and will not allow you to do anything useful, but booting.

Note that the complete GENERIC kernel (including drivers for every device supported) is over 1MB in size; you can't load this kernel with only 1MB of CHIP RAM, 2MB is required. The basic INSTALL kernel will load with 1MB CHIP fine however.

It is possible to run NetBSD in a low memory situation, because it uses a mechanism called paging. It writes currently unused parts of programs to the disk, thus freeing some memory for other parts. Writing to and reading from disk is very slow, compared to the execution of programs in memory, so the system will be too slow to be useable. So, to have an actual useable system, you should have at least 4MB of FAST-RAM, preferably more. When you want to use X-Windows, a graphical user interface on top of NetBSD, you probably need about 8MB or even more to do anything useful.