Commodore Amiga 2000
Commodore Amiga 2000
The first of the big-box Amigas, the Amiga 2000 is the successor to original Amiga 1000. They are nearly identical in operation, with the 2000 having much more expansion capability.
Internally, the 2000 has a video slot, a processor slot, as well as five Amiga expansion slots and four IBM-style expansions slots, but two of these are either-or. The IBM-style slots are for power only, as the Amiga does not have the circuitry built-in to communicate with PC cards. What good is this? Some PC cards such TBCs (Time Base Corrector) manipulate external video signals and don't necessarily need to communicate with the host computer. Also, with a "Bridgeboard" or similar emulator card installed, the Amiga can run MS-DOS and utilize PC cards.
The Amiga slots are "autoconfig", or what Microsoft now calls "plug-n-play". There are no jumpers or switches, you just plug the cards in and the system recognizes and configures them automatically - remember that this was in 1987.
Hundreds if not thousands of expansion cards are available for the Amiga, ranging from the ordinary to the amazing-PC and Macintosh emulation memory expansion CPU accelerators SCSI controllers networking video cards audio cards video capture parallel,serial ports non-linear video editing real-time video special-effects
Amiga Hardware Database (amiga.resource.cx) "old-computers.com" The Unofficial Eric Schwartz Web Site
The Commodore Amiga 2000 is the successor of the Amiga 1000. As the Amiga 500 was the "low-end" model of the new products, the 2000 was considered the "high-end" model in 1985.
Like the original Amiga, it uses the same memory configuration with chip RAM (512 KB which can be accessed by the custom chips) and fast RAM (the rest of memory which can be accessed only by the CPU).
There are three drive bays : two 3.5" front bays and one 5.25" front bay. A 5.25" floppy drive or a half-height hard drive could be mounted into this last bay.
A Commodore 8088-CPU bridgeboard (a PC-on-a-card) was available. When operating, 128k RAM is used as a "bridge" between the PC bus and the Amiga Bus. Two programs (called ARead and AWrite) make the data exchange between PC and Amiga possible. The ISA slots can be used only with the "bridge" card and are unused in "Amiga mode".
There are in fact 3 models and many variations of the A2000 :
The Amiga 2000A, the "original A2000" was designed in Germany and was based on a German Amiga 1000 motherboard. The system was based upon an interesting design but was restricted in many ways (the thin Agnus could only use 512 Kb RAM). The machine had a number of reliability problems representing a refinement of 1985 technology rather than an step forward.
The Amiga 2000B is a kind of mix between the redesigned German 2000A and a cost-reduced version of the A500. It is generally referred in the UK as the B2000.
The Amiga 2000C is the final version of the A2000. It is based upon the improved ECS Chipset, but otherwise it is identical to the 2000B. It is known as the Amiga 2000+ in the US and was shipped with the new improved Kickstart 2.04.
The model with a built-in disk controller and a hard disk was called the Amiga 2000HD, it was shipped with an A209x SCSI controller and a SCSI hard disk drive installed.
The A2500 systems were based upon the final revisions of the A2000-B motherboard design before the A3000 was released.
The A1500 was a UK-specific machine derived from the A2000, retailing at ?99 (UKP) during 1990. Apart from shipping with two floppy drives, 1Mb memory and a new nameplate there is hardly any difference between the A1500 and the A2000.
Commodore Amiga编辑本段回目录
科技史上对于Commodore Amiga的痛苦历史并没有太多的记载，也许Commodore Amiga根本就没有干出什么惊天动地的事情来。从记录的事件来看，Commodore Amiga把一款非常不错的硬件通过错误的市场决策和严重的环境，或是这两者的结合给做消失了。
迫于无奈，Commodore Amiga只得在1994年宣布破产，Amiga商标和科技也被德国公司Escom Technologies购买，并以Amiga Technologies的名称出现在市场上，在1996年初，该公司宣布计划推出Amiga 1200电脑的加固版本，并命名为Walker，该电脑在设计上下足了工夫。
那么，Amiga是天才，还是蠢材呢？尽管Amiga信誓旦旦，并打算单独提供主板，这样消费者就能把购买的Amiga主板放在一个标准的电脑机箱中。不过，Amiga的追随者是一个混合的群体，他们有很多人表示Walker的机箱看上去像一个甲虫。
直到现在我们还不知道Walker是否能够改变Amiga的命运，直到在1997年Escom宣布破产之前，我们才看到一些Walker的原型。
主要参数编辑本段回目录
| Ship Date: | 1987 |
| Price: | US $1,500 |
| CPU: | Motorola 68000 @ 7.14 MHz |
| RAM: | 512K stock, 8Meg max |
| Display: | 16 colors at 640 X 400 |
| 4096 colors at 320 X 200. | |
| Ports: | parallel, serial, floppy |
| RGB video, stereo audio | |
| Storage: | Internal 880K 3.5-inch floppy |
| optional hard drive | |
| OS: | AmigaDOS |
| "Workbench" GUI |
 |  |
| NAME | AMIGA 2000 |
| MANUFACTURER | Commodore |
| TYPE | Home Computer |
| ORIGIN | U.S.A. |
| YEAR | March 1987 |
| END OF PRODUCTION | 1990 |
| KEYBOARD | Full-stroke keyboard with seperated numeric keypad and arrow keys |
| CPU | Motorola MC 68000 |
| SPEED | 7.14 mHz |
| CO-PROCESSOR | Fat Agnus (MMU), Paula (Sound & IO), Denise (video), Gary, OCS/ECS chipset |
| RAM | 512k or 1Mb (512K CHIP, 512K FAST on board), depending on models up to 9Mb : 1Mb Chip RAM + 8Mb FAST RAM |
| ROM | 256 KB (DOS 1.2) |
| TEXT MODES | 60 x 32 / 80 x 32 |
| GRAPHIC MODES | 320 x 256 / 320 x 512 / 640 x 256 / 640 x 512 |
| COLORS | 32 (for 320 x X modes), 16 (for 640 x X modes) among 4096 + 2 special modes EHB (64 colors) + HAM (4096 colors) |
| SOUND | 4 voice 8 bit PCM |
| I/O PORTS | 4 PC ISA slots (2 AT & 2 XT), Processor card slot, 5 x Zorro II slots, Video slot, Serial/RS232, Parallel/Centronics, RGB & composite video outputs, Mouse, 2 x Stereo audio, Keyboard, External floppy |
| BUILT IN MEDIA | one 3.5'' disk-drive (880k) SCSI HD in 2000HD models |
| OS | AMIGA WorKBench 1.3, Kickstart 1.2, 1.3 then 2.04 |
| POWER SUPPLY | Built-in PSU |
| PRICE | ?000 (UK, 1986) |
详解编辑本段回目录
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The first of the big-box Amigas, the Amiga 2000 is the successor to original Amiga 1000. They are nearly identical in operation, with the 2000 having much more expansion capability.
While the 1000 has only one internal 3.5-inch floppy drive, the 2000 has room for two, with an additional expansion bay for a larger 5.25-inch drive, CD-ROM, tape backup, etc. 
Internally, the 2000 has a video slot, a processor slot, as well as five Amiga expansion slots and four IBM-style expansions slots, but two of these are either-or. The IBM-style slots are for power only, as the Amiga does not have the circuitry built-in to communicate with PC cards. What good is this? Some PC cards such TBCs (Time Base Corrector) manipulate external video signals and don't necessarily need to communicate with the host computer. Also, with a "Bridgeboard" or similar emulator card installed, the Amiga can run MS-DOS and utilize PC cards.
The Amiga slots are "autoconfig", or what Microsoft now calls "plug-n-play". There are no jumpers or switches, you just plug the cards in and the system recognizes and configures them automatically - remember that this was in 1987.
Hundreds if not thousands of expansion cards are available for the Amiga, ranging from the ordinary to the amazing-
相关链接编辑本段回目录
参考文献编辑本段回目录
http://www.amigau.com/spock/a2000.html
http://oldcomputers.net/amiga2000.html
http://oldcomputers.net/amiga2000.html
http://www.old-computers.com/MUSEUM/computer.asp?c=63&st=1
