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Amiga Fast File System
The Amiga Fast File System (abbreviated AFFS, or more commonly historically as FFS) is a file system used on the Amiga personal computer. The previous Amiga filesystem was never given a specific name and known originally simply as "DOS" or AmigaDOS. Upon the release of FFS, the original filesystem became known as Amiga Old File System (OFS). OFS, which was primarily designed for use with floppy disks, had been proving slow to keep up with hard drives of the era. FFS was designed as a full replacement for the original Amiga filesystem. FFS differs from its predecessor mainly in the removal of redundant information. Data blocks contain nothing but data, allowing the filesystem to manage the transfer of large chunks of data directly from the host adapter to the final destination. Characteristics OFS was the predecessor to FFS. Before FFS was released, AmigaOS had a single filesystem simply called AmigaDOS: this uses 24 bytes per sector for redundancy data, providing for reconstruct ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amiga
Amiga is a family of personal computers introduced by Commodore in 1985. The original model is one of a number of mid-1980s computers with 16- or 32-bit processors, 256 KB or more of RAM, mouse-based GUIs, and significantly improved graphics and audio compared to previous 8-bit systems. This includes the Atari ST—released earlier the same year—as well as the Macintosh and Acorn Archimedes. Based on the Motorola 68000 microprocessor, the Amiga differs from its contemporaries through the inclusion of custom hardware to accelerate graphics and sound, including sprite (computer graphics), sprites and a blitter, and a pre-emptive multitasking operating system called AmigaOS. The Amiga 1000 was released in July 1985, but production problems kept it from becoming widely available until early 1986. The best-selling model, the Amiga 500, was introduced in 1987 along with the more expandable Amiga 2000. The Amiga 3000 was introduced in 1990, followed by the Amiga 500 Plus, and Am ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Professional File System
The Professional File System is a filesystem originally developed commercially for the Amiga, now distributed on Aminet with a 4-clause BSD license. It is a compatible successor of AmiFileSafe (AFS), with an emphasis on added reliability and speed compared to standard Amiga filesystems. It also features multi-user abilities like the older MuFS. The device is split into two main areas. At the beginning of the device is the metadata section, which consists of a root block, and a generic array of blocks that can be allocated to store metadata. The rest of the device is another contiguous generic array of blocks that can be allocated to store data. The metadata section usually uses a few percent of the device, depending on the size of the device. The metadata is stored as a tree of single blocks in the metadata section. The entire directory structure is recorded in the metadata, so the data section purely contains data from files. The metadata describes the location of data in file ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aminet
Aminet is the world's largest archive of Amiga-related software and files. Aminet was originally hosted by several universities' FTP sites, and is now available on CD-ROM and on the web. According to Aminet, as of 3 September 2022, it has 83930 packages online. History In January 1992, Swiss student Urban Müller took over a software archive that had been started by other members of a computer science students' club. Soon the archive became mirrored worldwide and in 1995 started being distributed on monthly CD-ROMs. By using a single master site (then wuarchive.wustl.edu) for creating ftp scripts for each slave site, Aminet reduced to a bare minimum the effort to set up new mirror sites. Aminet also illustrates practical use of metadata schema by software repositories. Reports of daily additions to this software archive were posted automatically to Usenet (de.comp.sys.amiga.archive), or could be requested as an email newsletter. Most of the programs on Aminet were public domain or s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
LHA (file Format)
LHA or LZH is a freeware Data compression, compression utility and associated file format. It was created in 1988 by , a doctor and originally named LHarc. A complete rewrite of LHarc, tentatively named ''LHx'', was eventually released as ''LH''. It was then renamed to ''LHA'' to avoid conflicting with the then-new MS-DOS 5.0 ("load high") command. The original LHA and its Microsoft Windows, Windows port, LHA32, are no longer in development because Yoshizaki is busy at work. Although no longer much used in the west, LHA remained popular in Japan until the 2000s. It was used by id Software to compress installation files for their earlier games, including ''Doom (1993 video game), Doom'' and ''Quake (video game), Quake''. Because some versions of LHA have been distributed with source code under the Permissive software license, permissive license, LHA has been ported to many operating systems and is still the main archiving format used on the Amiga computer, although it competed wi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of File Systems
The following lists identify, characterize, and link to more thorough information on Computer file systems. Many older operating systems support only their one "native" file system, which does not bear any name apart from the name of the operating system itself. Disk file systems Disk file systems are usually block-oriented. Files in a block-oriented file system are sequences of blocks, often featuring fully random-access read, write, and modify operations. * ADFS – Acorn's Advanced Disc filing system, successor to DFS. * AdvFS – Advanced File System, designed by Digital Equipment Corporation for their Digital UNIX (now Tru64 UNIX) operating system. * APFS – Apple File System is a next-generation file system for Apple products. * AthFS – AtheOS File System, a 64-bit journaled filesystem now used by Syllable. Also called AFS. * BFS – the Boot File System used on System V release 4.0 and UnixWare. * BFS – the Be File System used on BeOS, occasionally misnamed as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
PowerPC
PowerPC (with the backronym Performance Optimization With Enhanced RISC – Performance Computing, sometimes abbreviated as PPC) is a reduced instruction set computer (RISC) instruction set architecture (ISA) created by the 1991 Apple Inc., Apple–IBM–Motorola alliance, known as AIM alliance, AIM. PowerPC, as an evolving instruction set, has been named Power ISA since 2006, while the old name lives on as a trademark for some implementations of Power Architecture–based processors. PowerPC was the cornerstone of AIM's PReP and Common Hardware Reference Platform (CHRP) initiatives in the 1990s. Originally intended for personal computers, the architecture is well known for being used by Apple's Power Macintosh, PowerBook, iMac, iBook, eMac, Mac Mini, and Xserve lines from 1994 until 2005, when Mac transition to Intel processors, Apple migrated to Intel's x86. It has since become a niche in personal computers, but remains popular for embedded system, embedded and high-performanc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
AmigaOS Versions
AmigaOS is the proprietary native operating system of the Amiga personal computer. Since its introduction with the launch of the Amiga 1000 in 1985, there have been four major versions and several minor revisions of the operating system. Initially the Amiga operating system had no strong name and branding, as it was simply considered an integral part of the Amiga system as a whole. Early names used for the Amiga operating system included "CAOS" and "AmigaDOS". Another non-official name was "Workbench", from the name of the Amiga desktop environment, which was included on a floppy disk named "Amiga Workbench". Version 3.1 of the Amiga operating system was the first version to be officially referred to as "Amiga OS" (with a space between "Amiga" and "OS") by Commodore. Version 4.0 of the Amiga operating system was the first version to be branded as a less generic "AmigaOS" (without the space). What many consider the first versions of AmigaOS (Workbench 1.0 up to 3.0) are here ind ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2 GB Limit
The 2 GB limit refers to a physical memory barrier for a process running on a 32-bit operating system, which can only use a maximum of 2 GB of memory. The problem mainly affects 32-bit versions of operating systems like Microsoft Windows and Linux, although some variants of the latter can overcome this barrier. It is also found in servers like FTP servers or embedded systems like Xbox. The use of Physical Address Extension ( PAE) can help overcome this barrier. While Linux, FreeBSD, and most Unix-like operating systems support PAE so long as the hardware does, Windows needs this boot option enabled manually. This is known as 4-gigabyte tuning (4GT), or the /3GB switch. Once enabled, executables can have the "large address aware" flag set to increase their memory limit to 3 GB. 32-bit processes on 64-bit Windows are also limited to 2 GB. However, they can use the "large address aware" flag as well, except that it doesn't require the /3GB switch and increases t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Unofficial Patch
An unofficial patch is a patch for a piece of software, created by a third party such as a user community without the involvement of the original developer. Similar to an ordinary patch, it alleviates bugs or shortcomings. Unofficial patches do not usually change the intended usage of the software, in contrast to other third-party software adaptions such as mods or cracks. Motivation A common motivation for the creation of unofficial patches is missing technical support by the original software developer or provider. Reasons may include: *the software product reached its defined end-of-life and/or was superseded by a successor product (planned obsolescence) * the software was originally designed to operate in a substantially different environment and may require improvement/optimization (porting) * the developer has gone out of business and is not available anymore (abandonware) *support is not economically viable (e.g. localization for small markets) *a fast solution for a t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amiga Rigid Disk Block
In computing, a rigid disk block (RDB) is the block on a hard disk where the Amiga series of computers store the disk's partition and filesystem information. The IBM's PC equivalent of the Amiga's RDB is the master boot record (MBR). Unlike its PC equivalent, the RDB doesn't directly contain metadata for each partition. Instead it points to a linked list of partition blocks, which contain the actual partition data. The partition data includes the start, length, filesystem, boot priority, buffer memory type and "flavor", though the latter was never used. Because there is no limitation in partition block count, there is no need to distinguish primary and extended types and all partitions are equal in stature and architecture. Additionally, it may point to additional filesystem drivers, allowing the Amiga to boot from filesystems not directly supported by the ROM, such as PFS or SFS. The data in the rigid disk block must start with the ASCII bytes "RDSK". Furthermore, its posi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Byte Information Exchange
BYTE Information eXchange (BIX) was an online service created by ''BYTE''. History ''BYTE'' in the October 1984 issue announced BYTEnet, "a project in computer conferencing", with 200 beta testers who received free service during the "experiment". The magazine formally announced BIX in the June 1985 issue, offering an introductory sign-up fee of $25, and evening and weekend charges of $6 per hour of connect time: the service offered direct numbers in San Francisco, Los Angeles, Chicago, and Boston. It was a text-only Bulletin Board System-style site running the CoSy conferencing software. BIX originally ran on an Areté multiprocessor system based on the Motorola 68000, then 68020. By June 1986 the company had more than 6000 subscribers, and the magazine printed excerpts of BIX discussions. In 1987, with 17,000 users, BIX moved to a Pyramid 9820 running DC/OSx. When the Pyramid became too expensive to run, BIX was ported to a DEC Alpha server. McGraw-Hill also used the same softw ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Smart File System
The Smart File System (SFS) is a journaling filesystem used on Amiga computers and AmigaOS-derived operating systems (though some support also exists for IBM PC compatibles). It is designed for performance, scalability and integrity, offering improvements over standard Amiga filesystems as well as some special or unique features. Features SFS uses block sizes ranging from 512 (29) to 32768 (215) bytes with a maximum partition size of 128 GB. Its good performance, better than FFS, and lack of need for long "validation" in case of an error, is achieved by grouping multiple directory entries into a single block and by grouping meta data blocks together into clusters. A bitmap is used to keep track of free space, and file data is kept track of using extents arranged into a B+ tree structure. Integrity is maintained by keeping a transaction log of all changes made to metadata over a certain period of time. The log is written to disk first into free space and then meta data bl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
