Editing Amiga 2000 (section)

==Technical information==
The majority of A2000 systems shipped with Commodore's [[Original Chip Set]] and 1&nbsp;[[megabyte|MB]] of RAM (512&nbsp;[[kilobyte|KB]] of [[Amiga Chip RAM|"chip" RAM]] and 512&nbsp;KB additional RAM) and either AmigaOS 1.2 or 1.3. Later revisions shipped with the improved [[Amiga Enhanced Chip Set|Enhanced Chip Set]], 1&nbsp;MB "chip" RAM and AmigaOS 2.0.<ref name="knight">{{cite web | url=http://www.amigahistory.co.uk/a2000.html | last=Knight | first=Gareth | title=Commodore Amiga 2000}}</ref>

The A2000 shipped with a [[Motorola 68000]] CPU, running at 7.16&nbsp;MHz ([[NTSC]]) or 7.09&nbsp;MHz ([[PAL]]). The CPU can be upgraded to a [[68010]] by direct replacement. Official and third-party expansion boards, which fit in the CPU expansion slot, feature [[68020]], [[68030]], [[Motorola 68040|68040]] or [[68060]] microprocessors. Such upgrades may also accommodate additional RAM, [[Floating-point unit|FPU]]s, [[Memory management unit|MMU]]s and even [[SCSI]] controllers.

Memory capacity varies according to the hardware revision. Certain revisions of the A2000 can be upgraded to accommodate 1&nbsp;MB of chip RAM by installing an 8372A [[MOS Technology Agnus|Agnus]] chip. Likewise, 2&nbsp;MB can be accommodated by fitting an 8372B Agnus chip and adding extra memory. There is a practical limit of 8&nbsp;MB of additional RAM without the use of a CPU expansion card, due to the 68000's 24-bit address bus.

The A2000 brought a new capability to the Amiga line, the Zorro II bus. This expansion bus allows installation of compatible hardware through the [[AutoConfig]] standard, such as, graphic, sound, and network cards and [[Parallel ATA]], [[SCSI]] and [[USB]] controllers.

The [[Industry Standard Architecture|ISA]] slots can be activated by use of a bridgeboard, which connects the Zorro II and ISA buses. Such bridgeboards typically feature on-board [[IBM PC Compatible]] hardware, including [[Intel 80286]], [[80386]] or [[80486]] microprocessors allowing emulation of an entire IBM-PC system in hardware. The remaining ISA slots can then be used with industry standard hardware of the era, such as, network cards, graphics cards and hard drive controllers. In some A2000 models, the two 8-bit ISA slots can also be upgraded to 16-bit by fitting extension [[edge connector]]s.

The video slot presents clocks, all 12-bits of digital video, [[Genlock]] signals, and some control lines for use to add-on cards. This allows use of dedicated genlocks, display deinterlacers, and video-switching and effects systems such as NewTek's [[Video Toaster]].

===Specifications===
{| class="wikitable"
|-
! Attribute
! Specification<ref name="specs"/>
|-
|[[Central processing unit|Processor]]
|[[Motorola 68000]] at 7.16&nbsp;MHz ([[NTSC]]) or 7.09&nbsp;MHz ([[PAL]])
|-
|[[Random-access memory|RAM]]
|
1&nbsp;MB consisting of either:
* 512&nbsp;[[kilobyte|KB]] of [[Amiga Chip RAM|"chip" RAM]] and 512&nbsp;KB additional RAM{{ref label|mod_a|A|^}}{{ref label|mod_b|B|^}}
* 1&nbsp;[[megabyte|MB]] of "chip" RAM{{ref label|mod_c|C|^}}
Upgradeable to 2&nbsp;MB "chip" RAM (some models require hardware modification)<br/>
Upgradeable by further 8&nbsp;MB without CPU upgrade or up to 128&nbsp;MB with CPU upgrade
|-
|[[Read-only memory|ROM]]
|256 or 512&nbsp;KB [[Kickstart (Amiga)|Kickstart]] ROM
|-
|Chipset
|[[Original Chip Set]] (OCS){{ref label|mod_a|A|^}}{{ref label|mod_b|B|^}} or [[Amiga Enhanced Chip Set|Enhanced Chip Set]] (ECS){{ref label|mod_c|C|^}}
|-
|Video
|12-bit color palette (4096 colors)<br/>
Graphic modes with up to 32, 64 ([[Amiga Halfbrite mode|EHB]] mode) or 4096 ([[Hold-and-Modify|HAM]] mode) on-screen colors:
* 320×200 to 320×400[[interlaced|i]] (NTSC)
* 320×256 to 320×512i (PAL)
Graphic modes with up to 16 on-screen colors:
* 640×200 to 640×400i (NTSC)
* 640×256 to 640×512i (PAL)
ECS only graphic modes:
* 1280×200 to 1280×512i and 640×480[[progressive scan|p]]60 (VGA) with up to 4 on-screen colors
* 800×600i60 (Super72) with 2 on-screen colors
|-
|Audio
|4× 8-bit [[PCM]] channels (2 [[Stereophonic sound|stereo]] channels)<br/>
28&nbsp;kHz maximum [[Direct memory access|DMA]] [[sampling rate]] (56&nbsp;kHz in ECS-only modes)<br/>
70&nbsp;dB [[Signal-to-noise ratio|S/N ratio]]
|-
|Internal [[Computer Storage|storage]]
|3.5" [[SCSI]] [[hard disk drive]] (A2000HD only)
|-
|Removable storage
|3.5" [[Double density|DD]] [[floppy disk]] drive (880&nbsp;KB capacity)
|-
|Audio/video ports
|Analog RGB video out ([[D-subminiature|DB-23M]])<br/>
Monochrome composite video out ([[RCA connector|RCA]]){{ref label|mod_b|B|^}}{{ref label|mod_c|C|^}}<br/>
Audio out (2× RCA)<br/>
[[Genlock]] slot (internal){{ref label|mod_a|A|^}}<br/>
Video slot (internal){{ref label|mod_b|B|^}}{{ref label|mod_c|C|^}}
|-
|Input/output ports
|Keyboard port (5 pin [[DIN connector|DIN]])<br/>
2× Mouse/Gamepad ports ([[D-subminiature|DE9]])<br/>
[[RS-232]] [[serial port]] (DB-25M)<br/>
Centronics style [[parallel port]] (DB-25F)<br/>
[[Floppy disk]] drive port (DB-23F)
|-
|Expansion slots
|5× 100-pin 16-bit [[Amiga Zorro II|Zorro II]] slots ([[AutoConfig]])<br/>
2× 16-bit [[Industry Standard Architecture|ISA]] slots (requires bridgeboard to activate)<br/>
2× 8-bit ISA slots (requires bridgeboard to activate)<br/>
1× 86-pin CPU/MMU expansion slot
|-
|[[Operating system]]
|[[AmigaOS]] 1.2/1.3 (Kickstart 1.2/1.3 and [[Amiga Workbench|Workbench]] 1.2/1.3) or<br/> AmigaOS 2.0 (Kickstart 2.04 and Workbench 2.04){{ref label|mod_c|C|^}}
|-
|Other
|2× front accessible 3.5" drive bays<br/>
1× front accessible 5.25" drive bay<br/>
Battery-backed [[real-time clock]]
|}

====Notes====
<ol type="A">
<li>{{note label|mod_a|A|^}} Model A (revision 3.0-4.0), 1986
<li>{{note label|mod_b|B|^}} Model B (revision 4.1-5.0), 1986
<li>{{note label|mod_c|C|^}} Model C (revision 6.0-6.5), 1991
</ol>