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Concept
DEC 4000 AXP
Summary
The DEC 4000 AXP is a series of departmental server computers developed and manufactured by Digital Equipment Corporation introduced on 10 November 1992. These systems formed part of the first generation of systems based on the 64-bit Alpha AXP architecture and at the time of introduction, ran Digital's OpenVMS AXP or OSF/1 AXP operating systems.
The DEC 4000 AXP was succeeded by the end of 1994 by the AlphaServer 2000 and 2100 departmental servers.
There are two models of the DEC 4000 AXP:
Model 6x0, code named Cobra: 160 MHz DECchip 21064 (EV4) processor(s) with 1 MB L2 cache each.
Model 7x0, code named Fang: 190 MHz DECchip 21064 (EV4) processor(s) with 4 MB L2 cache each. It was introduced in October 1993.
The possible values of 'x' is 1 or 2. These numbers specify the number of microprocessors in the system.
The DEC 4000 AXP are two-way symmetric multiprocessing (SMP) capable systems that are housed in either a BA640 half-height cabinet or a BA641 19-inch rackmountable enclosure that contains two backplanes, a system backplane and a storage backplane. Plugged in the system backplane were one or two CPU modules, one to four memory modules, an I/O module, up to six Futurebus+ Profile B modules, and in the storage backplane, were one to four fixed media mass storage compartments and one removable media mass storage compartment.
Two models of CPU module were used in the DEC 4000 AXP, the KN430 (also known as the B2001-BA), used in the Model 600 Series, and the B2012-AA, used in the Model 700 Series. The KN430 contains a 160 MHz DECchip 21064 microprocessor with 1 MB of B-cache (L2 cache), whereas the B2012-AA contains a 190 MHz DECchip 21064 with 4 MB of B-cache. Two C3 (Command, Control and Communication) ASICs on the CPU module provide a number of functions, such as implementing the B-cache controller and the bus interface unit (BIU), which interfaces the microprocessor to the 128-bit address and data multiplexed system bus to enable communication between the CPU, memory and I/O modules. These ASICs were fabricated in a 0.
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