VAX 6000 Model 6x0
Code-named "Neptune", it was introduced on 30 November 1991. The Model 600 used the KA66A CPU module, which contained a 83.33 MHz (12 ns cycle time) NVAX microprocessor accompanied by an external 2 MB B-cache (L2 cache) and may have one to six such modules. The NVAX was connected to the NEXMI ASIC via the NDAL bus, a 64-bit address data multiplexed system bus clocked at 27.78 MHz (36 ns cycle time). The NEXMI ASIC interfaced the NVAX to the XMI2 bus, by providing functions such as the translation of NDAL bus commands to XMI bus commands. It also implemented the ROMBUS used by supporting devices on the CPU module such as the console. The NEXMI was a semi-custom ASIC fabricated in Digital's CMOS-3 CMOS process. It contained 0.25 million transistors on a 0.595 by 0.586 inch die packaged in a custom 339-pin ceramic pin grid array (CPGA). The system supported a maximum of 1 GB of memory.
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