DECpc AXP 150
The DECpc AXP 150, code-named Jensen, is an entry-level workstation developed and manufactured by Digital Equipment Corporation. Introduced on 25 May 1993, the DECpc AXP 150 was the first Alpha-based system to support the Windows NT operating system and the basis for the DEC 2000 AXP entry-level servers. It was discontinued on 28 February 1994, succeeded by the entry-level Multia and the entry-level and mid-range models of the AlphaStation family. The charter for the development and production of the DEC 2000 AXP was held by Digital's Entry Level Solutions Business, based in Ayr, Scotland.
DEC 2000 AXP
The DEC 2000 AXP family are entry-level servers based on the DECpc AXP 150. Differences were support for Digital's
Model 300
The DEC 2000 Model 300 AXP, code-named Jensen, is identical to the DECpc AXP 150 but was intended to be used as a server. Some options available for the DECpc AXP 150 are not available for the Model 300. It was introduced on 12 October 1993, and was discontinued on 28 February 1994.
Model 500
The DEC 2000 Model 500 AXP, code-named
Description
The DECpc AXP 150 systems used a 150 MHz
The 128-bit memory subsystem supports 16 to 128 MB of memory. Standard 36-bit, 70 nanosecond SIMMs with
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) memory kit.The DECpc AXP 150 has six EISA slots for expansion. Pre-installed EISA cards typically comprised a
Unlike other similar Alpha systems from Digital at the time, such as the
Because the DECchip 21064's signalling is incompatible with the EISA chipset and the system peripherals, the DECchip signals are interfaced to two buses, an address and command bus and a 32-bit data bus that masquerades as the
This arrangement of buffering and converting buses and control signals resulted in an inefficient I/O subsystem and as a result, the EISA bus only achieved a peak bandwidth of 25 MB/s (compared to 33 MB/s in standard PCs).
A
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,
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). Archived 2008-09-08 at the Wayback Machine