VAX 4000
Encyclopedia
The VAX 4000 was a family of low-end minicomputers developed and manufactured by Digital Equipment Corporation
(DEC) using microprocessors implementing the VAX
instruction set architecture (ISA). The VAX 4000 succeeded the MicroVAX
family. It was the last family of low-end VAX systems, as the platform was discontinued by Compaq.
chip set with a 128 KB external secondary cache protected by ECC built from 84 ns SRAM. It supported one to four MS670-BA (32 MB) or MS670-CA (64 MB) memory modules for 32 to 128 MB of memory. Q-bus
was used for expansion. The Model 300 could be upgraded to a Model 400, Model 500 or Model 600 by replacing the backplane, CPU and memory module(s).
microprocessor with 128 KB of external tertiary cache.
or VAX 4000 Model 200. It used the KA600 CPU module containing a NVAX
microprocessor.
Digital Equipment Corporation
Digital Equipment Corporation was a major American company in the computer industry and a leading vendor of computer systems, software and peripherals from the 1960s to the 1990s...
(DEC) using microprocessors implementing the VAX
VAX
VAX was an instruction set architecture developed by Digital Equipment Corporation in the mid-1970s. A 32-bit complex instruction set computer ISA, it was designed to extend or replace DEC's various Programmed Data Processor ISAs...
instruction set architecture (ISA). The VAX 4000 succeeded the MicroVAX
MicroVAX
The MicroVAX was a family of low-end minicomputers developed and manufactured by Digital Equipment Corporation . The first model, the MicroVAX I, was introduced in 1984...
family. It was the last family of low-end VAX systems, as the platform was discontinued by Compaq.
VAX 4000 Model 300
The VAX 4000 Model 300, code-named "Pele", was introduced on 9 July 1990 at DECworld in Boston, Massachusetts, replacing the MicroVAX 3800 and 3900. It used the time-sharing KA670-AA CPU module containing a 35.71 MHz (28 ns cycle time) RigelRigel (microprocessor)
Rigel was a microprocessor chip set developed and fabricated by Digital Equipment Corporation that implemented the VAX instruction set architecture . It was introduced on 11 July 1989 with the introduction of the VAX 6000 Model 400, the first system to feature the chip set. Rigel was also used in...
chip set with a 128 KB external secondary cache protected by ECC built from 84 ns SRAM. It supported one to four MS670-BA (32 MB) or MS670-CA (64 MB) memory modules for 32 to 128 MB of memory. Q-bus
Q-Bus
The Q-bus was one of several bus technologies used with PDP and MicroVAX computer systems manufactured by the Digital Equipment Corporation of Maynard, Massachusetts....
was used for expansion. The Model 300 could be upgraded to a Model 400, Model 500 or Model 600 by replacing the backplane, CPU and memory module(s).
VAX 4000 Model 200
VAX 4000 Model 200, code-named "Spitfire", was introduced in January 1991 as replacement for the MicroVAX 3400. It was positioned beneath the VAX 4000 Model 300. It used the KA660 CPU module containing a 28.57 MHz (35 ns cycle time) SOC microprocessor. It supported 16 to 64 MB of memory.VAX 4000 Model 500
The VAX 4000 Model 500, code-named "Omega/N", was introduced on 30 October 1991, with availability in December 1991. It succeeded the VAX 4000 Model 300, but the older system remained available as a lower cost alternative. It used the KA680 CPU module containing a 71.43 MHz (14 ns cycle time) NVAXNVAX
The NVAX is a microprocessor developed and fabricated by Digital Equipment Corporation that implemented the VAX instruction set architecture . The NVAX was a high-end single-chip VAX microprocessor. A variant of the NVAX, the NVAX+, differed in the bus interface and external cache supported, but...
microprocessor with 128 KB of external tertiary cache.
VAX 4000 Model 100
The VAX 4000 Model 100, code-named "Cheetah-Q", is an entry-level VAX 4000 system introduced on 7 July 1992. It used the KA52 CPU module containing a 72 MHz (14 ns cycle time) NVAX microprocessor with 128 KB of external tertiary cache. It supported up to 128 MB of memory.VAX 4000 Model 400
The VAX 4000 Model 400, code-named "Omega", was a distributed server, positioned as a mid-range VAX 4000 system, introduced on 7 July 1992. It used the KA675 CPU module containing a 63 MHz (16 ns) NVAX microprocessor with 128 KB of external tertiary cache. It supported 16 to 512 MB of memory.VAX 4000 Model 600
The VAX 4000 Model 600, code-named "Omega/N+", was a distributed server, positioned as a high-end VAX 4000 system ,introduced on 7 July 1992. It used the KA690 CPU module containing an 83 MHz (12 ns) NVAX microprocessor with and 512 KB of external tertiary cache.VAX 4000 Model 100A
The VAX 4000 Model 100A, code-named "Cheetah-Q", was introduced on 12 October 1993. It used the KA52 CPU module containing a 72 MHz (14 ns cycle time) NVAX microprocessor with 128 KB of external tertiary cache. It supported up to 128 MB of memory.VAX 4000 Model 500A
The VAX 4000 Model 500A, code-named "Omega/N", was introduced on 12 October 1993. It used the KA681 CPU module containing a 71.43 MHz (14 ns cycle time) NVAX microprocessor with 128 KB of external tertiary cache.VAX 4000 Model 600A
The VAX 4000 Model 600A, code-named "Omega/N+", was introduced on 12 October 1993. It used the KA691 CPU module containing an 83 MHz (12 ns cycle time) NVAX microprocessor with 512 KB of external tertiary cache.VAX 4000 Model 700A
The VAX 4000 Model 700A, code-named "Legacy", was introduced on 12 October 1993. It used the KA692 CPU module containing a 100 MHz (10 ns cycle time) NVAX microprocessor with 2 MB of external tertiary cache.VAX 4000 Model 105A
The VAX 4000 Model 105, code named "Cheetah-Q+", was introduced on 12 April 1994. It used the KA53 CPU module containing an 83 MHz (12 ns cycle time) NVAX microprocessor with 128 KB of external tertiary cache. It supported up to 128 MB of memory.VAX 4000 Model 505A
The VAX 4000 Model 505A, code-named "Omega/N+", was introduced in late August 1994. It used an 83 MHz (12 ns) NVAX microprocessor with 512 KB of external tertiary cache.VAX 4000 Model 705A
The VAX 4000 Model 705A, code-named "Legacy+", was introduced in late August 1994. It used the KA694 CPU module containing a 111.12 MHz (9 ns cycle time) NVAX microprocessor with 2 MB of external tertiary cache.VAX 4000 Model 106A
The VAX 4000 Model 106A, code-named "Cheetah-Q++", used the KA54 CPU module containing a 100 MHz (10 ns cycle time) NVAX microprocessor with 512 KB of external tertiary cache. It was replaced by the VAX 4000 Model 108.VAX 4000 Model 108
The VAX 4000 Model 108, code-named "Cheetah-Q++", was introduced on 8 October 1996 to replace the VAX 4000 Model 106A. It was discontinued on 30 September 2000, with the last systems shipped on 31 December 2000. It used the KA57 CPU module containing a 100 MHz (10 ns cycle time) NVAX microprocessor with 512 KB of external tertiary cache. It supported up to 256 Mb of memory with SIMMs using an industry standard form factor, double that of the previous model. The change from a proprietary SIMM to an industry standard SIMM was to lower costs, which also included reducing the size of the enclosure and more provisions for disks.VAX 4000 Model 50
The VAX 4000 Model 50, code-named "VAXbrick", was an upgrade for MicroVAX 3x00MicroVAX
The MicroVAX was a family of low-end minicomputers developed and manufactured by Digital Equipment Corporation . The first model, the MicroVAX I, was introduced in 1984...
or VAX 4000 Model 200. It used the KA600 CPU module containing a NVAX
NVAX
The NVAX is a microprocessor developed and fabricated by Digital Equipment Corporation that implemented the VAX instruction set architecture . The NVAX was a high-end single-chip VAX microprocessor. A variant of the NVAX, the NVAX+, differed in the bus interface and external cache supported, but...
microprocessor.