DEC 2000 AXP
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The DEC 2000 AXP or DECpc AXP 150 is a series of entry level server and workstation computers respectively, developed and manufactured by Digital Equipment Corporation. Launched on October 28, 1992, the DECpc AXP 150 was the first Alpha AXP based system to support the Windows NT operating system. The DEC 2000 AXP also supported Digital's OpenVMS AXP and OSF/1 AXP (later renamed to Digital UNIX) operating systems.
The development of the DEC 2000 AXP was led by DEC's Entry Level Solutions Business based in Ayr, Scotland. It was later succeeded by the entry level Multia and the mid range AlphaStation.
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[edit] Models
There are two models of the DEC 2000 AXP:
- Model 300, codenamed Jensen, also marketed as a Windows NT workstation, branded as the DECpc AXP 150.
- Model 500, codenamed Culzean, marketed as a server running either Windows NT Advanced Server, DEC OSF/1 AXP or OpenVMS. The Model 500 was similar to the Model 300, but housed in a larger pedestal-type enclosure capable with space for up to 12 3.5 in hard disks and incorporating an Intelligent Front Panel (IFP) for system monitoring and control. The Model 500 also supported either two 415 W power supplies or one power supply plus a battery Standby Power Supply (SPS).
[edit] Description
The DEC 2000 AXP systems used a 150 MHz DECchip 21064 microprocessor with a 512 KB[1] B-cache (L2 cache), which is implemented with 17 nanosecond SRAMs on the motherboard.
Unlike other similar Alpha AXP systems of the time, such as the DEC 3000 AXP, the DEC 2000 AXP used the EISA bus instead of the TURBOchannel bus. The decision to use the EISA bus was due to cost requirements. The EISA bus was an industry standard bus, and there were more vendors offering EISA options, in addition to EISA chipsets. In contrast, the TURBOchannel bus, while offering higher performance, would have required more expensive ASICs like the DEC 3000 AXP, and would have reduced the number of options available.
The EISA bus was implemented by a subset of the Intel 82350DT chipset, and features a 82358 EBC (EISA Bus Controller) chip, a 82357 ISP (Integrated System Peripheral) chip and two 82352 EBB (EISA Bus Buffer) chips. The DEC 2000 AXP provides six EISA expansion slots. Pre-installed EISA cards typically comprised a Compaq QVision VGA adapter, Adaptec AHA-1742 SCSI host adapter, and a DEC DE422 Ethernet adapter.
A VLSI Technologies VL82C106 combination chip, was used to provide the real time clock as well as the serial, LPT, and PS/2 ports.
The system supports 16 to 128 MB of memory. Standard 36-bit SIMMs clocked at 70 nanosecond with parity protection are used to populate eight SIMM slots, which are organised in two banks of four slots each. The DEC 2000 AXP supports two memory options, a 16 MB (4 × 4 MB SIMMs) and a 64 MB (4 × 16 MB SIMMs) kit.
The DECpc AXP 150 running Windows NT can only use a VGA monitor. The DEC 2000 AXP models running OpenVMS or DEC OSF/1 AXP can use a VT-series terminal or equivalent.
[edit] References
- DECpc AXP 150 and DEC 2000 Model 300 AXP Customer Technical Information, EK-A0636-TM.001, July 1993, Digital Equipment Corporation.
- DECpc AXP 150 and DEC 2000 Model 300 AXP User Information, EK-A0634-OM.001, July 1993, Digital Equipment Corporation.
- DEC 2000 Model 500 AXP User Information, EK-A0675-OM.001, January 1994, Digital Equipment Corporation.
- DEC 2000 Model 500 AXP Customer Technical Information, EK-A0676-TM.001, January 1994, Digital Equipment Corporation.
- PB22H-KB System Module Hardware Reference Information, EK-A0638-TD.001, 14 July, 1993, Digital Equipment Corporation.
- David G. Conroy, Thomas E. Kopec, and Joseph R. Falcone (1994), "The Evolution of the Alpha AXP PC", Digital Technical Journal 6(1).
[edit] Notes
- ^ When applied to computer memory (RAM or cache) the quantities KB, MB and GB are defined as:
- 1 KB = 1024 B
- 1 MB = 1024 KB
- 1 GB = 1024 MB,
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