Amiga

This article is about the family of home computers. For other uses, see Amiga (disambiguation).

The former Amiga logo, as used by Commodore-Amiga Inc.

The Amiga 1000 (1985) was the first model released.

The Amiga is a family of personal computers that was sold by Commodore in the 1980s and 1990s. The first model was launched in 1985 as a high-end home computer and became popular for its graphical, audio and multi-tasking abilities. The Amiga provided a significant upgrade from 8-bit computers, such as the Commodore 64, and the platform quickly grew in popularity among computer enthusiasts. The best selling model, the Amiga 500, was introduced in 1987 and became the leading home computer of the late 1980s and early 1990s in much of Western Europe. In North America success was more modest. The Amiga went on to sell approximately six million units.^[1] Second generation Amiga systems (A1200 and A4000) were released in 1992. However, poor marketing and failure to repeat the technological advances of the first systems meant that the Amiga quickly lost its market share to competing platforms, such as the fourth generation game consoles, Apple Macintosh and IBM PC compatibles.^[1]

Based on the Motorola 68000 series of microprocessors, the machine sports a custom chipset with graphics and sound capabilities that were unprecedented for the price, and a pre-emptive multitasking operating system called AmigaOS.

Although early Commodore advertisements attempted to cast the computer as an all-purpose business machine, the Amiga was most commercially successful as a home computer, with a wide range of games and creative software.^[2][3] It was also a less expensive alternative to the Apple Macintosh and IBM-PC as a general-purpose business or home computer. The platform became particularly popular for gaming and demoscene activities. It also found a prominent role in the desktop video, video production, and show control business, leading to affordable video editing systems such as the Video Toaster. The Amiga's native ability to simultaneously play back multiple digital sound samples made it a popular platform for early "tracker" music software. The relatively powerful processor and ability to access several megabytes of memory led to the development of several 3D rendering packages, including LightWave 3D and Aladdin 4D.

Since the demise of Commodore, various groups have marketed successors to the original Amiga line. Eyetech sold PowerPC based hardware under the AmigaOne brand from 2002 to 2005, and Acube sells the AmigaOS 3 compatible Minimig systems with a MC68000 compatible CPU and AmigaOS 4 compatible Sam440 and Sam460 systems with PowerPC processors.

The name Amiga was chosen by the developers specifically from the Spanish word for a female friend,^[4] and because it occurred before Apple and Atari alphabetically. It also gave the message that the Amiga computer line was 'user friendly' as a pun or play on words.^[5]

History

Main article: History of the Amiga

“	"The Amiga was so far ahead of its time that almost nobody--including Commodore's marketing department--could fully articulate what it was all about. Today, it's obvious the Amiga was the first multimedia computer, but in those days it was derided as a game machine because few people grasped the importance of advanced graphics, sound, and video. Nine years later, vendors are still struggling to make systems that work like 1985 Amigas. --Byte Magazine, August 1994	”

Logo used by Commodore in the US during the late 1980s

Amiga Technologies Logo. (1996)

Development of the Amiga began in 1982 with Jay Miner as the principal hardware designer of Amiga Corporation. It was initially intended to be a next generation video game machine, but was redesigned as a general purpose computer after the North American video game crash of 1983.^[6][7] A prototype of the full computer was shown to the public for the first time at the Summer Consumer Electronics Show in 1984.^[8] In order to bring the design to market Commodore International bought Amiga Corporation and funded development. The first model was released in 1985 as simply "The Amiga from Commodore", later to be retroactively dubbed the Amiga 1000. The following year the Amiga product line was expanded with the introduction of two new models; the Amiga 2000 for high-end graphics and business use, and the Amiga 500 for home use. Commodore later released other Amiga models, both for low-end gaming use and high-end productivity use.

In 1994, Commodore filed for bankruptcy and its assets were purchased by Escom, a German PC manufacturer, who created the subsidiary company Amiga Technologies. They re-released the A1200 and A4000T, and introduced a new 68060 version of the A4000T. However, Escom in turn went bankrupt in 1997. The Amiga brand was then sold to another PC manufacturer, Gateway 2000, which had announced grand plans for it. However, in 2000, Gateway sold the Amiga brand without having released any products. The current owner of the trademark, Amiga, Inc., licensed the rights to sell hardware using the AmigaOne brand to computer vendors Eyetech Group, Ltd. and A-Eon Technology CVBA. Unofficial Amiga clones were developed by Italian hardware company, Acube.

Hardware

At its core, the Amiga has a custom chipset consisting of several coprocessors, which handle audio, video and direct memory access independently of the Central Processing Unit (CPU). This architecture freed up the Amiga's processor for other tasks and gave the Amiga a performance edge over its competitors, particularly in terms of video-intensive applications and games.^[9]

The general Amiga architecture uses two distinct bus subsystems, namely, the chipset bus and the CPU bus. The chipset bus allows the custom coprocessors and CPU to address "Chip RAM". The CPU bus provides addressing to other subsystems, such as, conventional RAM, ROM and the Zorro II or Zorro III expansion subsystems. This architecture enables independent operation of the subsystems. CPU expansion boards may provide additional custom buses. Additionally, "busboards" or "bridgeboards" may provide ISA or PCI buses.^[9]

Central processing unit

The Motorola 68000 series of microprocessors was used in all Amiga models from Commodore. While the 68000 family has a 32-bit design, the 68000 used in several early models is generally referred to as 16-bit.^[10][11] The 68000 has a 16-bit external data bus so must transfer 32 bits of data in two consecutive steps, a technique called multiplexing — all this is transparent to the software, which was 32-bit from the beginning. The 68000 could address 16 MB of physical memory. Later Amiga models featured full 32-bit CPUs with a larger address space and instruction pipeline facilities. Commodore's design choice to remain with the 68000 architecture ensured that code was backward-compatible across the Amiga line.

CPU upgrades were offered by both Commodore and third-party manufacturers. Most Amiga models can be upgraded either by direct CPU replacement or through expansion boards. Such boards often featured faster and higher capacity memory interfaces and hard disk controllers.

Towards the end of Commodore's time in charge of Amiga development there were suggestions that Commodore intended to move away from the 68000 series to higher performance RISC processors, such as the PA-RISC.^[12][13] However, these ideas were never developed before Commodore filed for bankruptcy. Despite this, third-party manufacturers designed upgrades featuring a combination of 68000 series and PowerPC processors along with a PowerPC native micro-kernel and software.^[14] Later Amiga clones featured PowerPC processors only.

Custom chipset

The custom chipset at the core of the Amiga design appeared in three distinct generations, with a large degree of backward-compatibility. The Original Chip Set (OCS) appeared with the launch of the A1000. OCS was eventually followed by the modestly improved Enhanced Chip Set (ECS) in 1990 and finally by the 32-bit Advanced Graphics Architecture (AGA) in 1992. Each chipset consists of several coprocessors which handle raster graphics, digital audio, direct memory access and communication between various peripherals (e.g., CPU, memory and floppy disks). In addition, some models featured auxiliary custom chips which performed tasks, such as, SCSI control and display de-interlacing.

Graphics

A 4096 color HAM picture created with Photon Paint in 1989.

All Amiga systems can display full-screen animated graphics with 2, 4, 8, 16, 32, 64 (EHB Mode) or 4096 colors (HAM Mode). Models with the AGA chipset (A1200 and A4000) also have non-EHB 64, 128, 256 and 262144 (HAM Mode) color modes and a palette expanded from 4096 to 16.8 million colors. The Amiga chipset can genlock — adjust its own screen refresh timing to match an NTSC or PAL video signal. When combined with setting transparency, this allows an Amiga to overlay an external video source with graphics. This ability made the Amiga popular for many applications, and provides the ability to do character generation and CGI effects far more cheaply than earlier systems. Some frequent users of this ability included wedding videographers, TV stations and their weather forecasting divisions (for weather graphics and radar), advertising channels, music video production, and 'desktop video'. The NewTek Video Toaster was made possible by the genlock ability of the Amiga.

In 1988 the release of the Amiga A2024^[15] fixed-frequency monochrome monitor with built-in framebuffer and flicker fixer hardware provided the Amiga with a choice of high-resolution graphic modes (1024×800 for NTSC and 1024×1024 for PAL).

Sound

The sound chip, named Paula, supports four sound channels (two for the left speaker and two for the right) with 8-bit resolution for each channel and a 6-bit volume control per channel. The analog output is connected to a low-pass filter, which filters out high-frequency aliases when the Amiga is using a lower sampling rate (see Nyquist limit). The brightness of the Amiga's power LED is used to indicate the status of the Amiga’s low-pass filter. The filter is active when the LED is at normal brightness, and deactivated when dimmed (or off on older A500 Amigas). On Amiga 1000 (and very first Amiga 500 and Amiga 2000 model), the power LED had no relation to the filter's status, a wire needed to be manually soldered between pins on the sound chip to disable the filter. Paula can read directly from the system's RAM, using direct memory access (DMA), making sound playback without CPU intervention possible.

Although the hardware is limited to four separate sound channels, software such as OctaMED uses software mixing to allow eight or more virtual channels, and it was possible for software to mix two hardware channels to achieve a single 14-bit resolution channel by playing with the volumes of the channels in such a way that one of the source channels contributes the most significant bits and the other the least ones.

The quality of the Amiga's sound output, and the fact that the hardware is ubiquitous and easily addressed by software, were standout features of Amiga hardware unavailable on PC platforms for years. Third-party sound cards exist that provide DSP functions, multi-track direct-to-disk recording, multiple hardware sound channels and 16-bit and beyond resolutions. A retargetable sound API called AHI was developed allowing these cards to be used transparently by the OS and software.

Kickstart firmware

Main article: Kickstart (Amiga)

Kickstart is the bootstrap firmware. Its purpose is to initialize the Amiga hardware and core components of AmigaOS and then attempt to boot from a bootable volume, such as a floppy disk or hard disk drive.

The first production Amiga, the Amiga 1000, required Kickstart to be loaded first from floppy disk into 256 kB of RAM reserved for this purpose. Later models generally hold Kickstart on an embedded ROM chip, improving start-up times. Models can be upgraded by replacing the ROM. Like the Amiga 1000, early Amiga 3000 systems loaded Kickstart from hard (or floppy) disk as the machine was launched while AmigaOS 2.0 was still in beta development.

Several third-party vendors produced switchable socket doublers to allow two ROM chips to plug into the single ROM socket on the motherboard. These became popular as later Kickstart versions caused some backwards compatibility problems with earlier Amiga software titles. The effect of these switchable doublers was a convenient dual boot system, with a choice of two distinct OS versions via a pre-determined key sequence at reboot, or via a two way switch installed in the case, depending on the specific version installed.

Peripherals

8-bit sound sampling hardware for the Amiga

The Amiga was one of the first home computers for which inexpensive sound sampling and video digitization accessories were available. As a result of this and the Amiga's audio and video capabilities the Amiga became a popular system for editing and producing both music and video.

Many expansion boards were produced for Amiga computers to improve the performance and capability of the hardware, such as memory expansions, SCSI controllers, CPU boards, and graphics boards. Other upgrades include genlocks, Ethernet cards, modems, sound cards and samplers, video digitizers, extra serial ports, and IDE controllers. Additions after the demise of Commodore company are USB cards.

The most popular upgrades were memory, SCSI controllers and CPU accelerator cards. These were sometimes combined into the one device.

Early CPU accelerator cards feature full 32-bit CPUs of the 68000 family such as the Motorola 68020 and Motorola 68030, almost always with 32-bit memory and usually with FPUs and MMUs or the facility to add them. Later designs feature the Motorola 68040 and Motorola 68060. Both CPUs feature integrated FPUs and MMUs. Many CPU accelerator cards also had integrated SCSI controllers.

Phase5 designed the PowerUP boards (Blizzard PPC and CyberStorm PPC) featuring both a 68k (a 68040 or 68060) and a PowerPC (603 or 604) CPU, which are able to run the two CPUs at the same time (and share the system memory). The PowerPC CPU on PowerUP boards is usually used as a coprocessor for heavy computations (a powerful CPU is needed to run for example MAME, but even decoding JPEG pictures and MP3 audio was considered heavy computation at the time). It is also possible to ignore the 68k CPU and run Linux on the PPC (project Linux APUS), but a PowerPC native AmigaOS promised by Amiga Technologies GmbH was not available when the PowerUP boards first appeared.^[16]

24-bit graphics cards and video cards were also available. Graphics cards are designed primarily for 2D artwork production, workstation use, and later, gaming. Video cards are designed for inputting and outputting video signals, and processing and manipulating video.

Perhaps the most famous video card in the North American market was the NewTek Video Toaster. This was a powerful video effects board which turned the Amiga into an affordable video processing computer which found its way into many professional video environments. Due to its NTSC-only design it did not find a market in countries that used the PAL standard, such as in Europe. In PAL countries the OpalVision card was popular, although less featured and supported than the Video Toaster. Low-cost time base correctors (TBCs) specifically designed to work with the Toaster quickly came to market, most of which were designed as standard Amiga bus cards.

Various manufacturers started producing PCI busboards for the A1200 and A4000, allowing standard Amiga computers to use PCI cards such as Voodoo graphic cards, Sound Blaster sound cards, 10/100 Ethernet cards, and TV tuner cards. Other manufacturers produced hybrid boards which contained an Intel x86 series chip, allowing the Amiga to emulate a PC.

PowerPC upgrades with Wide SCSI controllers, PCI busboards with Ethernet, sound and 3D graphics cards, and tower cases allowed the A1200 and A4000 to survive well into the late nineties.

Expansion boards were made by Richmond Sound Design that allow their show control and sound design software to communicate with their custom hardware frames either by ribbon cable or fiber optic cable for long distances, allowing the Amiga to control up to eight million digitally controlled external audio, lighting, automation, relay and voltage control channels spread around a large theme park, for example. See Amiga software for more information on these applications.

Other popular devices:

• Trumpcard 500 Zorro-II SCSI interface.
• A590 SCSI hard disk controller.^[17]
• A3070 SCSI tape backup unit with a capacity of 250 MB.^[18]
• A2065 Ethernet Zorro-II interface. The first Ethernet interface for Amiga; uses the AMD Am7990 chip.^[19][20] The same interface chip is used in DECstation as well.
• Ariadne Zorro II Ethernet interface using AMD Am7990.^[20]
• A4066 Zorro II Ethernet interface using SMC 91C90QF.^[20][21]
• X-Surf from Individual Computers using Realtek 8019AS.^[20]
• A2060 Arcnet.^[22]
• A1010 Floppy drive. Consists of an 3,5" DD, 300 rpm, 250 kbit/s drive unit connected via DB-23 connector. Track-to-track delay is on the order of ~94 ms. The default capacity is 880 kB. Many clone drives were available, and products such as CatWeasel makes it possible to read and write Amiga and other special disc formats on standard x86 PCs.^[23]
• NE2000 compatible PCMCIA ethernet cards for Amiga 600 and Amiga 1200^[24]

Networking

Amiga had three networking interface APIs:

• AS225 - Is the official Commodore TCP/IP stack API with hardcoded drivers in revision 1 (AS225r1) for the A2065 Ethernet and the A2060 Arcnet interfaces.^[22] In revision 2 (AS225r2) the SANA-II interface was used.
• SANA-II — Is a standardized API for hardware of network interfaces. It uses an inefficient buffer handling scheme, and lacks proper support for promiscuous and multicast modes.
• Miami Network Interface (MNI) - Is an API that doesn't have the problems which SANA-II suffers from. It requires AmigaOS v2,04 or higher.

Different network media was used:

Type	Speed	Example
Ethernet	10/100 Mbit/s	A2065[19]
ARCNET	2.5 Mbit/s	A560,[25] A2060[26]
Floppy disk controller	250 kbit/s	Amitrix: Amiga-Link[27]
Serial port	≤ 115.2 kbit/s
Parallel port	~1600 kbit/s	Village Tronic: Liana[28]
Token ring	1.5 Mbit/s	Nine Tiles: AmigaLink (9 Tiles)[29]
AppleTalk / LocalTalk	230,4 - 460 kbit/s	PPS-Doubletalk[30]

Casing

Most Amiga cases are made from ABS plastics which may become brown with time. This can be reversed by using the public domain chemical mix "Retr0bright".

Models and variants

Main article: Amiga models and variants

The original Amiga models^[31] were produced from 1985 to 1996. They are, in order of appearance: 1000, 2000, 500, 1500, 2500, 3000, 3000UX, 3000T, CDTV, 500+, 600, 4000, 1200, CD32, and 4000T. The PowerPC based AmigaOne was later produced from 2002 to 2005. Some companies have also released Amiga clones.

Commodore Amiga

The Amiga 500 (1987) was the best selling model.^[32]

The Amiga 4000 (1992) was the last desktop computer made by Commodore.

The first Amiga model, the Amiga 1000, was launched in 1985 as a high-end home computer and became popular for its impressive graphics, video and audio capabilities. In 2006, PC World rated the Amiga 1000 as the seventh greatest PC of all time, stating "Years ahead of its time, the Amiga was the world's first multimedia, multitasking personal computer".^[33]

Following the A1000, Commodore updated the desktop line of Amiga computers with the Amiga 2000 in 1987, the Amiga 3000 in 1990, and the Amiga 4000 in 1992, each offering improved capabilities and expansion options. However, the best selling models were the budget models, particularly the highly successful Amiga 500 (1987) and the Amiga 1200 (1992). The Amiga 500+ (1991) was the shortest lived model, replacing the Amiga 500 and lasting only six months until it was phased out and replaced with the Amiga 600 (1992), which in turn was also quickly replaced by the Amiga 1200.^[34]

The CDTV, launched in 1991, was a CD-ROM based all-in-one multimedia system. It was an early attempt at a multi-purpose multimedia appliance in an era before multimedia consoles and CD-ROM drives were common. Unfortunately for Commodore, the system never achieved any real commercial success.

Commodore's last Amiga offering before filing for bankruptcy was an attempt to capture a portion of the highly competitive 1990s console market with the Amiga CD32 (1993), a 32-bit CD-ROM games console. Though discontinued after Commodore's demise it met with moderate commercial success in Europe.

Following purchase of Commodore's assets by Escom in 1995, the A1200 and A4000T continued to be sold in small quantities until 1996, though the ground lost since the initial launch and the prohibitive expense of these units meant that the Amiga line never regained any real popularity.

Several Amiga models contained references to songs by the rock band The B-52's. Early A500 units, at least, had the words "B52/ROCK LOBSTER"^[35] silk-screen printed onto their printed circuit board, a reference to the popular song "Rock Lobster" The Amiga 600 referenced "JUNE BUG" (after the song "Junebug") and the Amiga 1200 had "CHANNEL Z" (after "Channel Z").^[36]

AmigaOS 4 systems

Main article: AmigaOS 4

AmigaOS 4 (OS4) is designed for PowerPC Amiga systems and currently runs on both Amigas equipped with CyberstormPPC or BlizzardPPC accelerator boards, and on the PPC Teron series based AmigaOne computers built by Eyetech under license by Amiga Inc. AmigaOS 4.0 had been available only in developer pre-releases for numerous years until it was officially released in December 2006. Due to the nature of some provisions of the contract between Amiga Inc. and Hyperion Entertainment (the Belgian company which is developing the OS), the commercial AmigaOS 4 had been available only to licensed buyers of AmigaOne motherboards.

AmigaOS 4.0 for Amigas equipped with PowerUP accelerator boards was released in November 2007. The most recent release AmigaOS is 4.1.^[37]

No new Amiga hardware has been released since the AmigaOne; however Acube Systems has entered an agreement with Hyperion under which it has ported AmigaOS 4 to its Sam440ep and Sam460ex line of PowerPC-based motherboards.^[38] In 2009 version for Pegasos II from Genesi/bPlan GmbH was released in co-operation with Acube Systems.^[39] Moreover, in 2009/2010, A-Eon Technology announced the AmigaOne X1000.

Amiga hardware clones

Long-time Amiga developer MacroSystem entered the Amiga-clone market with their DraCo nonlinear video edit system. It appears in two versions, initially a tower model and later a cube. DraCo expanded upon and combined a number of earlier expansion cards developed for Amiga (VLabMotion, Toccata, WarpEngine, RetinaIII) into a true Amiga-clone powered by Motorola's 68060 processor. The DraCo can run AmigaOS 3.1 up through AmigaOS 3.9. It is the only Amiga-based system to support FireWire for video I/O. DraCo also offers an Amiga-compatible ZORRO-II expansion bus and introduced a faster custom DraCoBus, capable of 30 MB/sec transfer rates (faster than Commodore's ZORRO-III). The technology was later used in the Casablanca system, a set-top-box also designed for non-linear video editing.

In 1998, Index Information released the Access, an Amiga-clone similar to the Amiga 1200, but on a motherboard which could fit into a standard 5 1/4" drive bay. It features either a 68020 or 68030 CPU, with a redesigned AGA chipset, and runs AmigaOS 3.1.

In 1998, former Amiga employees (John Smith, Peter Kittel, Dave Haynie and Andy Finkel to mention few) formed new company called PIOS. Their hardware platform, PIOS One, was aimed at Amiga, Atari and Macintosh users. The company was renamed to Met@box in 1999 until it folded.^[40]

The NatAmi (short for Native Amiga) hardware project began in 2005 with the aim of designing and building an Amiga clone motherboard that is enhanced with modern features.^[41] The NatAmi motherboard is a standard Mini-ITX-compatible form factor computer motherboard, powered by a Motorola/Freescale 68060 and its chipset. It is compatible with the original Amiga chipset, which has been inscribed on a programmable FPGA Altera chip on the board. The NatAmi is the second Amiga clone project after the Minimig motherboard, and its history is very similar to that of the C-One mainboard developed by Jeri Ellsworth and Jens Schönfeld. From a commercial point of view, Natami's circuitry and design are currently Closed Source.^{[citation needed]} One goal of the NatAmi project is to design an Amiga-compatible motherboard that includes up-to-date features but that does not rely on emulation (as in WinUAE), modern PC Intel components, or a modern PowerPC mainboard. As such, NatAmi is not intended to become another evolutionary heir to classic Amigas (such as with AmigaOne or Pegasos computers). This "purist" philosophy essentially limits the resulting processor speed but puts the focus on bandwidth and low latencies. The developers also recreated the entire Amiga chipset, freeing it from Classic Amiga legacy limitations such as two megabytes of audio and video graphics RAM as in the AGA chipset, and rebuilt this new chipset by programming a modern FPGA Altera Cyclone IV chip. Later, the developers decided to create from scratch a new software-form processor chip, codenamed "N68050" that resides in the physical Altera FPGA programmable chip.^[42]

In 2006, two new Amiga clones were announced, both using FPGA based hardware synthesis to replace the Amiga OCS custom chipset. The first, the Minimig, is a personal project of Dutch engineer Dennis van Weeren. Referred to as "new Amiga hardware",^[43] the original model was built on a Xilinx Spartan-3 development board, but soon a dedicated board was developed. The minimig uses the FPGA to reproduce the custom Denise, Agnus, Paula and Gary chips as well as both 8520 CIAs and implements a simple version of Amber. The rest of the chips are an actual 68000 CPU, ram chips, and a PIC microcontroller for BIOS control.^[43] The design for Minimig was released as open source on July 25, 2007. In February, 2008, an Italian company Acube Systems began selling Minimig boards. A third party upgrade replaces the PIC microcontroller with a more powerful ARM processor, providing more functionality such as write access and support for hard disk images. The minimig core is being ported to the FPGArcade "Replay" board. The Replay uses a larger FPGA which will support the AGA chipset and a 63030 soft core. The Replay board is designed to emulate many older computers and classic arcade machines.

The second is the Clone-A system announced by Individual Computers. As of mid 2007 it has been shown in its development form, with FPGA-based boards replacing the Amiga chipset and mounted on an Amiga 500 motherboard.^[44]

In 2011 by ArcadeRetroGaming, called the Multiple Classic Computer, which emulates the Commodore 64. Support for Amiga software is planned.^[45]

Emulation

Main article: Amiga emulation

Like many popular but discontinued platforms, the Amiga has been the target of various emulation projects so that software developed for the Amiga can be run on other computer platforms without the original hardware. Such emulators attempt to replicate the functionality of the Amiga architecture in software. As mentioned above, attempts have also been made to replicate the Amiga chipset in FPGA chips.^[46]

One of the most challenging aspects of emulation is the design of the Amiga chipset, which relies on cycle-critical timings. As a result, early emulators did not always achieve the intended results though later emulator versions can now accurately reproduce the behavior of Amiga systems.

Operating systems

AmigaOS

Main article: AmigaOS

“	"[AmigaOS] remains one of the great operating systems of the past 20 years, incorporating a small kernel and tremendous multitasking capabilities the likes of which have only recently been developed in OS/2 and Windows NT. The biggest difference is that the AmigaOS could operate fully and multitask in as little as 250 K of address space. --John C. Dvorak, PC Magazine, October 1996.[47]	”

AmigaOS is a single-user multitasking operating system. It was developed first by Commodore International, and initially introduced in 1985 with the Amiga 1000. Original versions run on the Motorola 68000 series of microprocessors, while AmigaOS 4 runs only on PowerPC microprocessors. At the time of release AmigaOS put an operating system that was well ahead of its time into the hands of the average consumer. It was one of the first commercially available consumer operating systems for personal computers to implement preemptive multitasking.

Another notable feature was the combined use of both a command-line interface and graphical user interface. AmigaDOS was the disk operating system and command line portion of the OS and Workbench the native graphical windowing, icons, menu and pointer environment for file management and launching applications. Notably, AmigaDOS allowed long filenames (up to 107 characters) with whitespace and did not require file extensions. The windowing system and user interface engine which handles all input events is called Intuition.^[48]

The multi-tasking kernel was called Exec. It acts as a scheduler for tasks running on the system, providing pre-emptive multitasking with prioritised round-robin scheduling. It enabled true pre-emptive multitasking in as little as 256 kB of free memory.^[49]

Like other operating systems of the time, the OS lacks memory protection. This was because the 68000 CPU does not include a memory management unit and therefore there is no way to enforce protection of memory.^[50] Although this speeds and eases inter-process communication (programs can communicate by simply passing a pointer back and forth), the lack of memory protection made the AmigaOS more vulnerable to crashes from badly behaving programs, and fundamentally incapable of enforcing any form of security model since any program had full access to the system. A co-operational memory protection feature was implemented in AmigaOS 4 and could be retrofitted to old AmigaOS systems using Enforcer or CyberGuard tools.

The problem was somewhat exacerbated by Commodore's initial decision to release documentation relating not only to the OS's underlying software routines, but also to the hardware itself, enabling intrepid programmers who cut their teeth on the Commodore 64 to POKE the hardware directly, as was done on the older platform. While the decision to release the documentation was a popular one and allowed the creation of fast, sophisticated sound and graphics routines in games and demos, it also contributed to system instability as some programmers lacked the expertise to program at this level. For this reason, when the new AGA chipset was released, Commodore declined to release low-level documentation in an attempt to force developers into using the approved software routines.

Influence on other operating systems

AmigaOS directly or indirectly inspired the development of various operating systems. MorphOS and AROS clearly inherit heavily from the structure of AmigaOS as explained directly in articles regarding these two operating systems. AmigaOS also influenced BeOS, which featured a centralized system of Datatypes, similar to that present in AmigaOS. Likewise, DragonFlyBSD was also inspired by AmigaOS as stated by Dragonfly developer Matthew Dillon who is a former Amiga developer.^[51][52] WindowLab and amiwm are among several window managers for the X Window System seek to mimic the Workbench interface.^{[citation needed]}

Unix and Unix-like systems

Commodore-Amiga produced Amiga Unix, informally known as Amix, based on AT&T SVR4. It supports the Amiga 2500 and Amiga 3000 and was included with the Amiga 3000UX. Among other unusual features of Amix is a hardware-accelerated windowing system which can scroll windows without copying data. Amix is not supported on the later Amiga systems based on 68040 or 68060 processors.

Other, still maintained, operating systems are available for the classic Amiga platform, including Linux and NetBSD. Both require a CPU with MMU such as the 68020 with 68851 or full versions of the 68030, 68040 or 68060. There is also a version of Linux for Amigas with PowerPC accelerator cards. Debian and Yellow Dog Linux can run on the AmigaOne.

There is an official, older version of OpenBSD. The last Amiga release is 3.2. Minix 1.5.10 also runs on Amiga.^[53]

Emulating other systems

Main article: Emulation on the Amiga

The Amiga is able to emulate other computer platforms ranging from many 8-bit systems such as the Sinclair ZX Spectrum, Commodore 64, Nintendo Game Boy, Nintendo Entertainment System, Apple II and the TRS-80, up to platforms such as the IBM PC, Apple Macintosh and Atari ST. MAME (the arcade machine emulator) is also available for Amiga systems with PPC accelerator card upgrades.

Amiga software

Main article: Amiga software

The Amiga was a primary target for productivity and game development during the late 1980s and early 1990s. Software was often developed for the Amiga and the Atari ST simultaneously, since the ST had a similar CPU architecture.

Aminet was created in 1992 and until around 1996, was the largest public archive of software, art and documents for any platform.

Boing Ball

The Boing Ball.

The Boing Ball has been synonymous with Amiga since its public release in 1985. The bouncing ball (or other graphical elements) has been a popular theme in computer demo effects since the 1950s, when a bouncing ball demo was released for Whirlwind computers and became the primary theme for early Atari games Pong and Breakout. Commodore released a bouncing ball demo at the 1978 Consumer Electronics Show, to illustrate the capabilities of the VIC chip. A similar theme was used by Amiga Corporation to demonstrate the capabilities of the Amiga computer at the 1984 Winter Consumer Electronics Show in January 1984. It was a real-time animation showing a red-and-white spinning ball (about 1/4 screen size) bouncing up and down and casting a shadow on a wall behind it. The echoing deep Bong! sound and left-right motion was added soon after the show was over. Since then, the Boing Ball became one of the most well-known symbols for Amiga and compatible computers.^{[citation needed]} Within the context of this tradition of bouncing ball demos at the Consumer Electronics Show, CBS Electronics also showed a Bouncing Ball demo for the Atari VCS/2600, with a spinning and bouncing ball, at the same event.

The 1984 Boing Ball demo was one of the very first demos shown on the Amiga. It was specifically designed to take advantage of the Amiga's custom graphics, achieving a level of speed and smoothness not previously seen on an affordable computer. The 1984 demo ran standalone as there was no official DOS operating system and Intuition was just a glint in RJ Mical's eye at the time. A year later this demo was converted to operate in an Intuition Screen, allowing the higher resolution Amiga Workbench screen to be dragged down to make the Boing Ball visible from behind, bouncing up above the Workbench while the Workbench remained fully active. Since the Boing Ball used almost no CPU time (only to calculate the bounce angles - animation was handled by playfield vertical and horizontal scrolling tricks, the rotation animation was done with color cycling in the graphics chip, and of course the sound chip handled the sound), this made a particularly impressive demonstration of multitasking at the time.

The Boing Ball itself was never adopted as a trademark by Commodore. The official Amiga trademark is a rainbow-colored double checkmark.^[54]

Amiga community

When Commodore went bankrupt in 1994, there remained a very active Amiga community, which continued to support the platform long after mainstream commercial vendors abandoned it. The most popular Amiga magazine, Amiga Format, continued to publish editions until 2000, some six years after Commodore filed for bankruptcy. Another magazine, Amiga Active, was launched in 1999 and was published until 2001. Several magazines are in publication today, notably Amiga Future,^[55] which is available in both English and German; Bitplane.it,^[56] a bi-monthly magazine in Italian; and AmigaPower,^[57] a long-running French magazine.

In spite of declining interest in the platform there was a bi-weekly specialist column in the UK weekly magazine Micro Mart. There is also a web site,^[58] that has served as a community discussion and support resource since the 1994 bankruptcy. Other popular English-language fora also exist, particularly Amigaworld.net^[59] and English Amiga Board.^[60]

Notable historic uses

The Amiga series of computers found a place in early computer graphic design and television presentation. Below are some examples of notable uses and users:

• Season 1 and part of season 2 of the television series Babylon 5 were rendered in LightWave 3D on Amigas.^[61][62] Other television series using Amigas for special effects included SeaQuest DSV^[63] and Max Headroom.^[64]

In addition, many other celebrities and notable individuals have made use of the Amiga:^[65]

• Andy Warhol was an early user of the Amiga and appeared at the launch^[66] where he made a computer artwork of Debbie Harry.^[67] Warhol used the Amiga to create a new style of art made with computers, and was the author of a multimedia opera called "you are the one" which consists of an animated sequence featuring images of actress Marilyn Monroe assembled in a short movie with a soundtrack. The video was discovered on two old Amiga floppies in a drawer in Warhol's studio and repaired in 2006 by the Detroit Museum of New Art.^[68] The pop artist has been quoted as saying: "The thing I like most about doing this kind of work on the Amiga is that it looks like my work in other media."^[69][70]
• A pioneer of the Digital Art movement, Laurence Gartel, along with Jeff Bruette,^[71] personally taught Andy Warhol how to use the Amiga and relevant software.^[72]
• Actor Dick Van Dyke was a self-described "rabid" user of the Amiga, although he has since switched to other platforms and sold most of his Amiga equipment.^[73][74]
• Amigas were used in various NASA laboratories to keep track of multiple low orbiting satellites, and were still used up to 2003/04 (dismissed and sold in 2006). This is another example of long lifetime reliability of Amiga hardware, as well as professional use. Amigas were also used at Kennedy Space Center to run strip-chart recorders, to format and display data, and control stations of platforms for Delta rocket launches.^[75]
• Artist Jean "Moebius" Giraud credits the Amiga he bought for his son as a bridge to learning about "using paint box programs".^[76] He uploaded some of his early experiments to the file sharing forums on CompuServe.
• Tom Fulp is noted as saying he used the Amiga as his first computer for creating cartoons and animations.^[77]
• London Transport Museum developed their own interactive multi-media software for the CD32. The software included a walkthrough of various exhibits and a virtual tour of the museum.^[78]
• The "Weird Al" Yankovic film UHF contains a computer animated music video parody of the Dire Straits song "Money for Nothing", titled "Money For Nothing/Beverly Hillbillies". According to the DVD commentary track, this spoof was created on an Amiga home computer.^[79]
• Rolf Harris used an Amiga to digitize his hand-drawn art work for animation on his television series, Rolf's Cartoon Club.
• Todd Rundgren's video "Change Myself" was produced with Toaster and Lightwave.
• An Amiga 1000 can be seen in the movie Disorderlies in the background running a heart animation.
• An Amiga 4000 was in Michael Jackson's movie Ghosts. At the left of the screen, an Amiga monitor and keyboard can be easily seen at the end credit. (at exactly 38:40)
• Scottish pop artist Calvin Harris composed his debut album I Created Disco with an Amiga 1200.^[80]
• Susumu Hirasawa, a Japanese Electropop-artist is known for using Amigas to compose and perform music.
• Electronic musician Max Tundra also created his three albums with an Amiga 500.^[81]
• A black Commodore Amiga 1200 was seen on an episode of Bones, used as evidence to lead to a murder suspect. A clip of this show hosted on YouTube became infamous because of the high number of errors in such a minor mention. Among many other errors, an IBM 5150 (the first PC) was shown as its floppy drive, and it was described as using "a homemade operating system" with a "6800 chipset".^[82]
• Tom Berenger's character Gary Simmons uses an Amiga 500 for his KKK network in the 1988 movie Betrayed.
• Amiga 500 motherboards were used, in conjunction with a Laserdisc player and Genlock device, in arcade games manufactured by American Laser Games.^[83]
• A custom Amiga 4000T motherboard was used in the HDI 1000 medical ultrasound system built by Bothell, Washington based Advanced Technology Labs (now part of Philips Medical Systems).^[84]

Media

• 

  Amiga CD32

• 

  Amiga 600

• 

  Amiga 1200

• 

  Amiga mouse

See also

• Amiga games
• Aminet
• Attic Entertainment Software
• Hold-And-Modify
• Minimig
• Natami
• UAE (emulator)

References

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33. ^ PC World, The 25 Greatest PCs of All Time
34. ^ Commodore Amiga 500+
35. ^ RollerFink.de
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43. ^ ^{a b} HetNet.nl
44. ^ SiliconSonic.de
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46. ^ "Minimig available" announcement by Acube Systems
47. ^ From PC Magazine, October 22, 1996 Inside Track By John C. Dvorak
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51. ^ Re: User-Space Device Drivers, Matthew Dillon, Dragonfly Kernel mailing list, 28 February 2006. Retrieved 1 February 2008.
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53. ^ Minix Comp Wisdon
54. ^ Ryan Czerwinski (December 31, 2001). "Dr. Ryan Czerwinski of Merlancia Industries explains the origin of the Amiga Boing ball and checkmark". Amiga Network News. http://www.amigahistory.co.uk/originsboing.html. Retrieved 2010-11-21. 
55. ^ Amigafuture.de
56. ^ Bitplane.it
57. ^ Amigapower.free.fr
58. ^ Amiga.org
59. ^ AmigaWorld.net
60. ^ EAB.abime.net
61. ^ The Lurker's Guide to Babylon 5
62. ^ An Interview with Ron Thornton, October 16, 1995. "Effects are designed on an accelerated Amiga 2000 with a Video Toaster board in it, using LightWave 3-D and Modeler 3-D."
63. ^ Interview with Matt Gorner
64. ^ 'Max Headroom' on TechTV
65. ^ For other notable users see Famous Amiga Users at AmigaHistory.
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67. ^ Andy Warhol paints Debbie Harry on an Amiga, Uploaded by theisotope on March 7, 2008 on YouTube.
68. ^ "Artdaily article about the discovery and repair of "you are the one"". Artdaily. http://www.artdaily.com/section/news/index.asp?int_sec=2&int_new=18091. Retrieved 2007-01-07. 
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72. ^ Galleriiizu.com
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76. ^ "Moebius". Wired. http://www.wired.com/wired/archive/2.01/moebius.html. 
77. ^ Tol Fulp interview
78. ^ CD32: The Hyper-Museum Project
79. ^ UHF DVD commentary track
80. ^ "Calvin Harris". 2007-06-06. http://www.scala-london.co.uk/scala/event.php?id=656. Retrieved 2008-08-10. 
81. ^ "Track Reviews on Cokemachineglow". cokemachineglow. 2007-06-06. http://www.cokemachineglow.com/track_review/3960. Retrieved 2008-11-29. ^{[dead link]}
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External links

• History of the Amiga on Ars Technica
• Famous Amiga Uses
• Amiga, Inc.
• Amiga Hardware Database - details of Amiga hardware
• Big Book of Amiga Hardware - Big Book of Amiga Hardware
• Amiga Lorraine: finally, the next generation Atari? John J. Anderson, Creative Computing, April 1984
• On the Edge: The Spectacular Rise and Fall of Commodore Bagnall, Brian (2005), Variant Press, ISBN 0-9738649-0-7.
• The Amiga Guru Book by Ralph Babel, Self Published by Ralph Babel for Commodore and Amiga in 1989, 1993 (German), (English)
• Amiga community at Amigaworld.net
• Amiga.org - community forums and support
• FC-Jungle Memories.. Amiga Mods in MP3, author's cut
• BoingsWorld.de - German Podcast roundabout AMIGA
• www.cracktros.com Amiga Crackintro and Trainer Database in HD Video, biggest and most complete resource.
• [1] An interactive Amiga games database with screenshots, reviews, ratings, docs, cheats, walkthroughs, downloads, videos, emulators, music and a forum.