Retro · Commodore Amiga · 1985
Commodore Amiga — the Machine with Three Chips
On 23 July 1985 in New York, Commodore showed the Amiga 1000 — a home computer with a multitasking operating system, three specialised chips and sound from four digital channels. Around it grew the games, music and demoscene we remember today. Here is what is true about it, and what nostalgia has exaggerated.
- Operating system:
"a multitasking OS in 256 KB of ROM"→ the Amiga 1000 loads its kernel (Kickstart) from a floppy into 256 KB of writable memory; it is in ROM from the A500 onwards. [2][4] - Second Reality:
"a demo with Amiga MOD music, Assembly '93"→ this is a PC demo for MS-DOS by Future Crew, first place in the PC competition at Assembly 1993 — not an Amiga demo, and it has been removed from the section on the Amiga demoscene. [10] - Prices: A3000
$3,000→ $3,379; A600$600→ $499 (£399); A1200$600→ $599 (£399); A500+$400→ £399 in the UK; A2000$1,500→ $1,495. The A4000 price ($2,800) has been removed — it was not checked. [3][5] - Memory: A3000
"2 MB Chip RAM"→ 2 MB in total at launch (1 MB chip + 1 MB fast); 2 MB of chip is the maximum. [5] - Bankruptcy and successors:
"Escom, Gateway, Amiga Inc, KMOS"→ Escom (1995), Gateway 2000 (1997), then Amiga, Inc. "Amiga One FPGA hardware" → the AmigaOne is PowerPC-based (from 2002), not FPGA. [6] - Jay Miner:
"designed the Amiga with a problem in his heart"→ died on 20.06.1994 from complications of kidney failure; "two months after the bankruptcy" → about seven weeks. Removed: "Mitchy — an official member of the team" (unverifiable). [6][7] - Guru Meditation:
"right button — restart"→ the left button restarts, the right one calls the ROMWack debugger. Removed: "Commodore insist on changing it to Software Failure" (unverifiable). [8] - Hollywood:
"Disney — The Little Mermaid (1989), Beauty and the Beast (1991), SeaQuest DSV"→ removed as unverifiable; confirmed is that the first season and part of the second of "Babylon 5" were rendered with LightWave 3D on the Amiga. [6] - Games and demos: removed the unverifiable claims (the Korg M1 in Shadow of the Beast; "Commodore refuses funding" for Cannon Fodder; "Jordan Mechner is inspired" by Another World; the Arte and Voyage awards; "dot animation" in State of the Art, and others). Phenomena Megademo:
"1990"→ first place at a party in 1989. [9][10][11] - Chips and OS: removed "GPU architecture 15 years before Voodoo" (Voodoo dates from 1996), "Windows NT and Linux took multitasking from the Amiga", "Deluxe Paint → Photoshop", "64-bit file system" and the description of the MOD file that did not match the format. The Copper example has been kept and clarified. [1][3][12]
01 · THE LAUNCHThe launch and the machine
The Amiga was presented on 23 July 1985 at an event in the Vivian Beaumont Theater at Lincoln Center, New York, with Andy Warhol and Debbie Harry taking part [2]. The first 35,000 machines, made by Sanyo in Japan, went out to buyers in September, and the first shop sales were in October 1985. The base configuration cost $1,295 without a monitor; with an RGB monitor (about $300) the price was around $1,595 [2].
| Part | What it is | Note |
|---|---|---|
| Processor | Motorola 68000, 16/32-bit | 7.16 MHz (NTSC) / 7.09 MHz (PAL) [2] |
| Memory | 256 KB RAM | up to 512 KB with an internal module; externally — up to about 8.5 MB [2] |
| OS kernel | Kickstart, loaded from a floppy | into 256 KB of writable memory; the OS was still said to be unstable and is not in ROM [2] |
| Floppy | 3.5″ double density | 880 KB in its own format [3] |
| Graphics | OCS: 320 or 640 pixels per line | 200 (NTSC) or 256 (PAL) lines; 32 colours from a palette of 4,096 [3] |
| Sound | 4 × 8-bit PCM channels, stereo | up to about 28 kHz per channel [1][3] |
02 · THE CHIPSThe three chips — Agnus, Denise and Paula
The Amiga relies on three specialised chips that work in parallel with the processor. The manufacturer's manual describes them as the basis of the graphics and sound [1]. The names are a play on words: Agnus comes from "Address Generator Units", Denise from "Display Enabler", Paula from "Ports, Audio, UART & Logic" [3].
| Chip | What it is responsible for | Details |
|---|---|---|
| Agnus | Access to the shared memory (chip RAM) and DMA | It holds the Blitter (fast copying and filling of blocks of memory without the processor) and the Copper (a programmable co-processor synchronised with the monitor's beam). The original Agnus addresses 512 KB; later versions — 1 MB and 2 MB [3] |
| Denise | Video | 1–5 bitplanes (up to 32 colours from 4,096), 8 hardware sprites, a mode with two independent playfields (dual playfield) and the Halfbrite and HAM modes [1][3] |
| Paula | Sound and input/output | 4 channels of 8-bit PCM with DMA, with independent volume and frequency for each; it also controls the disk drive, the serial port and the interrupts [3] |
The next generation, AGA (1992), adds a palette of 16.8 million colours, of which 256 are used at once (262,144 in HAM-8 mode) [13].
03 · COPPERThe program that draws rainbows
The Copper runs a small program — a "Copper list" — in sync with the beam that draws the screen. It has only three kinds of instructions: MOVE (writes a value to a chipset register), WAIT (waits for the beam to reach a position) and SKIP (skips the next instruction) [3]. With them you can change colours, resolution and even whole buffers between two lines of the screen. That is why the OS can show screens of different resolution at the same time [3].
; Each pair of words is one instruction. Register $0180 = COLOR00 (background colour).
CopperList:
DC.W $5007,$FFFE ; WAIT: wait for line $50
DC.W $0180,$0F00 ; MOVE: the background turns red
DC.W $6007,$FFFE ; WAIT: line $60
DC.W $0180,$0F60 ; MOVE: orange
DC.W $7007,$FFFE ; WAIT: line $70
DC.W $0180,$0FF0 ; MOVE: yellow
DC.W $8007,$FFFE ; WAIT: line $80
DC.W $0180,$00F0 ; MOVE: green
DC.W $9007,$FFFE ; WAIT: line $90
DC.W $0180,$000F ; MOVE: blue
DC.W $FFFF,$FFFE ; WAIT for a position that is never reached — the end of the listNote: for the list to work, its address must be written into the Copper's registers. Only the list itself is shown here; the details are in chapter 2 of the manufacturer's manual [1].
04 · AMIGAOSMultitasking on a small machine
AmigaOS is one of the first mass-market operating systems for personal computers with pre-emptive multitasking [6]. The kernel is called Exec; its developer was Carl Sassenrath [14]. Multitasking works even in 256 KB of memory [6][14].
The system combines a command line and a graphical interface: AmigaDOS is the disk part and the command line, while Workbench is the desktop for files and programs; the standard graphical layer is called Intuition [6].
05 · THE GAMESThe games — the answer to the consoles
The Amiga has a distinctly gaming character: graphics with sprites, parallax scrolling and digital sound. Here are some of the most often mentioned games — only with facts that we were able to check [11].
| Game | Year | Who made it | What is interesting |
|---|---|---|---|
| Defender of the Crown | 1986 | Cinemaware (artist Jim Sachs) | Cinemaware's first game; it set a new standard for graphics. It came out without some of the planned features because the company needed revenue. |
| Shadow of the Beast | 1989 | Reflections / Psygnosis | Known for up to 12 levels of parallax scrolling and many colours on screen; music by David Whittaker, cover by Roger Dean. |
| Lemmings | 1991 | DMA Design / Psygnosis | The idea started from a small animation (8×8 pixels) drawn by Mike Dailly in Deluxe Paint. Programmers: Russell Kay, Mike Dailly and David Jones. It was later ported to many platforms; the estimate is about 20 million copies in all. |
| Another World | 1991 | Éric Chahi (Delphine Software) | Chahi developed it alone over about two years, with help from Jean-François Freitas on the music. The graphics are vector-based, and rotoscoping was used for the movements. |
| Sensible Soccer | 1992 | Sensible Software | The first title of the "Sensi" series, popular in the early 1990s. |
| The Chaos Engine | 1993 | The Bitmap Brothers | A top-down shooter for one or two players; artist Dan Malone. It came out first on the Amiga, with an AGA version as well. |
| Frontier: Elite II | October 1993 | David Braben | The sequel to Elite (1984); released for the Amiga, Atari ST and MS-DOS. |
06 · THE DEMOSCENEThe Amiga as a scene
The Amiga's hardware is almost identical in every machine — which is why demo authors compete to squeeze the "impossible" out of it. Most demos were written in 68000 assembly, often bypass the OS and write directly to the chips; the first larger demos date from 1987 — for example "Tech Tech" by Sodan & Magician 42 [10]. Among the foundational Amiga demos are the RSI Megademo, Kefrens Megademo VIII and "Hardwired" by Crionics & The Silents [10].
- Phenomena Megademo (Phenomena, Sweden) — first place at the Equinox and Horizon Party in 1989; Enigma by the same group — first place at the Anarchy Easter Party in 1991 [10]
- State of the Art (Spaceballs, Norway) — first place at The Party in December 1992; opinions at the time were divided — critics objected to the emphasis on visuals and the techno music [10]
- Desert Dream (Kefrens) — winner of the Amiga demo competition at The Gathering in 1993 [10]
07 · MODMusic from four channels
Paula's four channels gave birth to a whole genre — "tracker" music. The first tracker was Karsten Obarski's Ultimate Soundtracker (1987) and its MOD format [12]. A module contains recorded samples (instruments), patterns of notes and a list of the order in which to play them [12]. What is true about the format:
- The original version has 4 channels and up to 15 instruments; later variants allow 31 instruments [12].
- Each pattern is a table with 4 columns (one per channel) and 64 rows [12].
- The samples are 8-bit PCM, ready for Paula, and the pattern data is not packed — so playback hardly loads the processor [12].
- The four-byte marker "M.K." at offset 0x438 is the format's characteristic sign; it is the initials of Michael Kleps, not of Mahoney and Kaktus, as is often thought [12].
After production ended, MOD lived on in the demoscene, in independent games and in chiptune music [12].
08 · THE MODELSFrom the A1000 to the A4000
The prices are at launch, in the original currency [2][4][5]. The "Chipset" column is the most important: OCS is the first generation, ECS the improved one, AGA the one from 1992.
| Model | Released | Processor | Chipset | Price |
|---|---|---|---|---|
| Amiga 1000 | July 1985 | 68000 · 7 MHz | OCS | $1,295 (without a monitor) |
| Amiga 2000 | March 1987 | 68000 · 7 MHz | OCS | $1,495 |
| Amiga 500 | April–October 1987 | 68000 · 7 MHz | OCS (later ECS) | $699 / £499 |
| Amiga 3000 | June 1990 | 68030 · 16 or 25 MHz | ECS | $3,379 |
| Amiga 500+ | November 1991 | 68000 · 7 MHz | ECS | £399 (a pack in the UK) |
| Amiga 600 | March 1992 | 68000 · 7 MHz | ECS | £399 / $499 |
| Amiga 1200 | 21.10.1992 | 68EC020 · 14 MHz | AGA | £399 / $599 |
| Amiga 4000 | 21.10.1992 (the /040 model) | 68040 · 25 MHz | AGA | — (not checked) |
The Amiga 500 is Commodore's best-selling model, especially in Europe; the exact sales are disputed — one estimate speaks of six million, while Commodore UK claims the whole range sold between four and five million [4]. The A600 is the last model with a 68000 and ECS and adds an internal hard disk and a PCMCIA port [5].
09 · GURU MEDITATIONThe most famous error
"Guru Meditation" is the message the Amiga shows on a fatal crash — the analogue of the "blue screen" in Windows [8]. The name comes from an in-house joke from the early years: the company made the Joyboard — a controller for the Atari 2600 operated with the feet. The developers, irritated by the frequent crashes, made a game in which a person sits cross-legged on the board like a guru and has to stay still; if they move, you get a "guru meditation" [8].
Guru Meditation #00000003.00C01000. The first number is the 68000 exception (3 is an address error — a word access at an odd address), the second is the address of the task or memory block where the problem occurred (it is not a code address) [8]. The left mouse button restarts the machine, the right one calls the minimal debugger ROMWack [8].10 · THE LEGACYThe end and what remains
Commodore closed its Amiga division on 26 April 1994 and filed for bankruptcy three days later [6]. The assets were bought by the German company Escom in 1995, and in 1997 the Amiga branch passed to Gateway 2000; the brand was then sold to Amiga, Inc., which licensed the AmigaOne brand — PowerPC computers from 2002 [6]. In 2019 Amiga, Inc. sold its intellectual property to Amiga Corporation [6].
Jay Miner died on 20 June 1994, aged 62, from complications of kidney failure [7].
- Video: the NewTek Video Toaster (December 1990) gave small studios editing that would otherwise cost ten times as much; the first season and part of the second of "Babylon 5" were rendered with LightWave 3D on the Amiga [6][15].
- Music: MOD and tracker music continue to this day in the demoscene, independent games and chiptune [12].
- Trying to preserve it: the WinUAE emulator recreates Amiga models; it needs Kickstart (boot ROM) files. Music modules are in The Mod Archive, and demos in Pouët.
Since 2025, forty years have passed since the launch of the A1000.
11 · SOURCESSources
- Miner et al., "Amiga Hardware Reference Manual", 3rd edition, Addison-Wesley, 1991 (online edition) — amigadev.elowar.com (primary source)
- Wikipedia, "Amiga 1000" (secondary; cites Byte, August 1985, and "Introduction to the Amiga", 1986) — en.wikipedia.org/wiki/Amiga_1000
- Wikipedia, "Original Chip Set" (secondary) — en.wikipedia.org/wiki/Original_Chip_Set
- Wikipedia, "Amiga 500" — en.wikipedia.org/wiki/Amiga_500 (secondary)
- Wikipedia, "Amiga 2000", "Amiga 3000", "Amiga 4000", "Amiga 600", "Amiga 1200" — A2000 · A3000 · A4000 · A600 · A1200 (secondary)
- Wikipedia, "Amiga" and "Commodore International" — Amiga · Commodore International (secondary)
- Wikipedia, "Jay Miner" (secondary; cites the obituary in the San Jose Mercury News, 1994) — en.wikipedia.org/wiki/Jay_Miner
- Wikipedia, "Guru Meditation" (secondary; cites Robert J. Mical, "How We Created the AMIGA Computer", Info, January 1987) — en.wikipedia.org/wiki/Guru_Meditation
- Wikipedia, "Second Reality" (secondary) — en.wikipedia.org/wiki/Second_Reality
- Wikipedia, "Amiga demos", "Spaceballs (demogroup)", "Phenomena (Amiga demogroup)", "The Gathering (LAN party)" — Amiga demos · Spaceballs · Phenomena · The Gathering (secondary)
- Wikipedia, the articles on the games: Shadow of the Beast · Lemmings · Another World · Defender of the Crown · Sensible Soccer · The Chaos Engine · Frontier: Elite II (secondary)
- Wikipedia, "MOD (file format)", "Ultimate Soundtracker", "Module file" — MOD · Ultimate Soundtracker (secondary)
- Wikipedia, "Hold-And-Modify" and "Amiga Advanced Graphics Architecture" — HAM · AGA (secondary)
- Wikipedia, "Exec (Amiga)" — en.wikipedia.org/wiki/Exec_(Amiga) (secondary)
- Wikipedia, "Video Toaster" — en.wikipedia.org/wiki/Video_Toaster (secondary)
Checked on 03.10.2026. Prices are historical, in the original currency. Translations are ours. For most of the details about games and demos we have no primary source — reference works were used, so only claims confirmed there are included. Galin's opinion on the Amiga — at galin.kagami.bg.