Commodore  Amiga 4000

Amiga 3000, fully 32 bit

There are two models of the Commodore Amiga 4000:

  • A4000/040 - released October 1992 using Motorola 68040
  • A4000/030 - released April 1993 using Motorola 68EC030

The Amiga 4000 was an upgrade to the A3000 and introduced the Advanced Graphics Architecture chipset with enhanced graphics. The SCSI hard drive interface was replaced with the Parallel ATA system. The system came in two cases, first the desktop-case and later an expanded tower case that offers more room for expansion.

The AGA chipset is part of Commodore's third generation Amiga chipset and has improved graphical abilities. The palette is expanded from 12-bit color depth to 24-bit. This increased the number of possible colors from 4096 to 16.8million. There are also new HAM-8 color modes, with 262,144 colors on screen simultaneously. The AGA also has improved sprite capacity and an overall performance increase.

Expansion ports:

  • External:
    • 2 DE-9 ports for joystick, mouse or light-pen
    • 25-pin RS323 serial port
    • 25-pin parallel Centronics port
    • 2 RCA Audio Out
    • 6-pin mini DIN keyboard
    • DB-23F Floppy disk drive port
    • Analog RGB video out
  • Internal:
    • Internal ATA controller
    • 4 100pin 32-bit internal Zorro III slots
    • 1 AGA video slot
    • 3 16-bit ISA slots
    • 1 200-pin CPU expansion port
    • 4 72-pin SIMM memory slots

Motorola 68000 CPU Family

The Motorola 68000 is a 16/32-bit microprocessor that was first released in 1979. It was widely used in computers and other electronic devices during the 1980s and early 1990s. The 68000 was known for its advanced architecture, which included a 32-bit internal bus and a 24-bit address bus, allowing it to access up to 16 megabytes of memory. This made it more powerful than many other processors of its time, such as the Intel 8086 and Zilog Z80. It was also designed to be highly modular and expandable, with a large number of on-chip and off-chip peripherals.

Some of the most famous and successful computers that used the 68000 was the Commodore Amiga and the Atari ST, both of which were popular in the home and personal computer markets. Additionally, it was also used in workstations, such as the Sun 3 and Apollo DN3000, and in a wide variety of embedded systems and industrial control systems. The 68000 was also used in the Macintosh, the first model of the Macintosh was powered by a Motorola 68000 CPU. The processor was eventually succeeded by the 68020 and 68030, which offered improved performance and additional features.

The 68000 has a 32-bit instruction set, with 32-bit registers and a 16-bit internal data bus. The address bus is 24-bit and does not use memory segmentation, making it easier to address memory. There are three ALU's (Arithmetic Logic Unit), two for calculating addresses, and one for data, and the chip has a 16-bit external address bus.

The 68000 architecture was expanded with 32-bit ALUs, and caches. Here is a list with some 680x0 versions and their major improvements:

  • 68010 - Virtual memory support
  • 68020 - 32-bit ALU & Instruction Cache
  • 68030 - On-Chip MMU, 2x 256 byte cache
  • 68040 - 2x 4K Cache, 6 stage pipeline, FPU
  • 68LC040 - No Floating Point Unit (FPU)
  • 68060 - 2x 8K Cache, 10 stage pipelinet

Released 1990 Country United States Brand Type COMMO Amiga Desktops Name Amiga 4000 CPU Class 68000 CPU Motorola 68EC030 or 68040 @25 MHz Memory 2MB RAM, 18MB Max Sound Chip Paula - 4 DMA-driven 8-bit PCM channels Sound 4x8-bit channels @56 kHz stereo Display Chip 32-bit Advanced Graphics Architecture (AGA) Display 16.8 million color palette, with 262,144 simultanuous. Sprites AGA improved sprite capabilities System OS AmigaOS 3.0 Storage Internal 3.5" Floppy Disk Drive, 120MByte IDE Hard Disk Drive. Original Price $3,379
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Amiga  4000 (1990)
Books & Publications
6502 CPU
Collection of books on the 6502 and compatible CPUs
Commodore 8-bit
Collection of books for the Commodore computer platform
Magazines & Serials
German Commodore 64/128 Magazine and themed Specials (Sonderheft)
Commodore Magazine
Magazine for the Commodore 64/128/Amiga
Commodore Revue
Commodore Revue is a French Magazine dedicated to Commodore and later to the Commodore Amiga in particular. The name later changed to Amiga Revue.
Commodore World
BiMonthly magazine for Commodore users in the USA
Commodure User
Oldest British Comodore Magazine
Compute's Gazette
Compute!'s Gazette was a computer magazine of the 1980s, directed at users of Commodore's 8-bit home computers.
Computer Club
Una rivista italiana di informatica dedicata a tutti i computer Commodore. An Italian computer information magazine dedicated to the Commodore Computer.
RUN focused on 1980's Commodore 8bit hardware like the Commodore 64, VIC-20, Plus/4, C16,116, 264, and 128.
Your Commodore
Your Commodore was a magazine for the Commodore range of computers, including the Commodore 64, Amiga, and Commodore PC range.
World Wide Web Links
WikiPedia: Amiga Advanced Graphics Architecture
Wikipage about the Amiga Graphics architecture
Wikipedia: Motorola 68000 CPU Family
WikiPedia page on the Motorola 68000 series of processors