Visopsys

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Visopsys
Visopsys OS
Website	www.visopsys.org
Company/ developer	Andy McLaughlin
Source model	Open source
Latest stable release	0.69 / September 24, 2007
Kernel type	Monolithic kernel
License	GPL
Working state	Current

Visopsys (VISual OPerating SYStem) is a free software operating system for x86 personal computers available under the terms of the GNU General Public License (GPL). It was created entirely by a single hobbyist programmer, Andy McLaughlin. The development began in 1997.

1 Features
2 Partition Logic/Visopsys Disk Manager
3 VISOPSYS memory manager
4 References
5 External links

[edit] Features

Its own native graphical user interface.
Pre-emptive multitasking and multi-threading.
Supports FAT12/16/32 (read/write) and ext2/3 (read-only).
Supports NTFS, but not serial ATA hard disks.

[edit] Partition Logic/Visopsys Disk Manager

Partition Logic is a free hard disk partitioning and data management tool. It is a Visopsys OS program and is called Visopsys Disk Manager in the Visopsys OS. The version called Partition Logic is a Live CD or bootable Floppy, which has a minimal version of Visopsys OS with the only program installed being the Partition Program, much like the GParted Live USB. ^[1]

[edit] VISOPSYS memory manager

The quantity of memory in a system is determined at boot time by the VISOPSYS operating system loader. This amount of memory is then passed to the kernel at startup.

In Visopsys, virtual memory is enabled, and uses a paging system to translate linear address to physical address, instead of using a segmented plus paging approach. The size of each page is 4KB, the same as the page table entries in most page table in most operating system. 4KB is chosen because it corresponds to the size of virtual memory page in the earlier X86 architecture.