Commodore Amiga 2000
Type Personal computer
Released 1987
Discontinued 1991
Processor Motorola 68000 @ 7.16 MHz 7.09 MHz (PAL)
Memory 512 Kb (9.5 Mb maximum)
OS Amiga OS 1.2/1.3 ~ 2.0

The A2000, also known as the Commodore Amiga 2000, was released in 1987 (around the same time as the low-end high-volume model A500). Although aimed at the high-end market it was technically very similar to the A500, so similar in fact that the A2000B revision was outright based on the A500 design. What the A2000 had over the A500 was a bigger case with room for five Zorro II proprietary expansion slots, two 16-bit ISA slots, a CPU upgrade slot, and a battery-backed clock.

It should also be noted that, like the Amiga 1000 and unlike the Amiga 500, the A2000 came in a desktop case with a separate keyboard. The case was all in all more like that of the PC than that of the A1000, in that it lacked the open space underneath for hiding away the keyboard.

The A2000 was eventually succeeded by the Amiga 3000 in 1990.

  Revision A / B Boards - 1987
  CPU: Motorola 68000 (7.16 MHz NTSC, 7.09 MHz PAL) The CPU can be upgraded with CPU cards  
  Chipset: OCS (Original Chipset)  
  Audio (Paula): 4 voices / 2 channels (Stereo) 8-bit resolution / 6-bit Volume 28 kHz sampling rate 70 dB S/N Ratio  
  Video (Common resolutions): 320×200/256 with 32 colors, 64 colors in Halfbrite or 4096 in HAM-6 640×400/512i with 16 colors  
  Battery-backed clock  
  Memory: 256 Kb ROM for Kickstart code. 512 Kb (Max) / (1 Mb Max) of Chip RAM. 512 Kb Fast RAM in MMU slot / Soldered on motherboard. Practical upper limit of about 9 Mb of Fast RAM memory due to being limited to an 24-bit address bus.  
  Storage: 3.5" DD Floppy drive, capacity 880 Kb SCSI Hard drive in A2000HD systems.  
  Input/Output connections: Composite TV out (Black & White) Analogue RGB video plug (Male DB23) RCA audio plugs 2 x Game/Joy/Mouse ports (Male DE9) Keyboard port (5 pin DIN) RS232 Serial port (Male DB25) Centronics Parallel port (Female DB25) Port for external floppy drive (Female DB23)  
  Internal connectors: 5 Zorro II slots (16-bit, AutoConfig) 2 16-bit ISA slots (Inactive per default, only usable with a PC emulation Bridgeboard or bus bridge installed) 2 8-bit ISA slots (also inactive, some models could be fitted with extension edge connectors, upgrading these slots to 16 bits) 1 32 Pin Internal floppy connector
1 MMU / CPU Slot 1 Genlock video connector
  Casing: 204 Watt switching power supply 2 x 3.5" drive bays for 3.5" floppy drives or other Peripherals 1 x 5.25" drive bay for 5.25" floppy drive or other peripherals  
  Software (Bundled): AmigaOS 1.2 / 1.3 operation system. Kickstart 1.2 / 1.3 (In ROM) Voice synthesis library  
  Revision C Motherboard - 1991 ( Also known as the A2000+ it is for the most part identical to its forerunner.)  
  Chipset: ECS (Enhanced Chip Set) Video (New resolutions): 640×480 with 4 colors (Productivity) 800×600i with 2 colors (Super72)  
  Memory: 512 Kb ROM for Kickstart code. 1 Mb of Chip RAM (2 Mb Max)  
  Software (Bundled):
AmigaOS 2.0 operation system. (Kickstart 2.0/Workbench 2.0)
  Commodore UK sold a variant of the A2000, the A1500. The A1500 shipped with dual floppy drives, and 1MB of RAM as standard, along with the ECS chipset and Amiga OS 2.04.  

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