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A term describing a computer architecture based around an ALU, registers and data bus which are 64 bits wide.

64-bit processors were quite common in 1996, e.g. Digital Alpha, versions of Sun SPARC, MIPS, IBM AS/4000. the PowerPC and Intel were expected to move to 64 bits at their next generation - PPC 620 and Intel P7.

A 64-bit address bus allows the processor to address 18 million gigabytes as opposed to the mere 4 gigabytes allowed with 32 bits. There were in 1996 already hard disks which can hold over 4GB. Floating point calculations can also be more accurate.

A 64-bit OS is needed as well to take advantage of the CPU. In 1996 there were only a few 64-bit operating systems, including OS/400, Digital Unix, Solaris (partialy). A 32-bit OS can run on a 64-bit CPU.
References in periodicals archive ?
29 August 2019 - UK-based investment company Clear Leisure Plc has signed an agreement with joint venture partner 64Bit Ltd.
Purchase of computer equipment and devices for the needs of the municipal social assistance center in katowice, according to the following items: 1) part a - purchase of the above equipment: a) office software package - 32 pieces; b) computer set - 32 pieces; c) lcd monitor - 37 pieces; d) windows 10 pro 64bit pl operating system or equivalent - 32 items; e) large monochrome laser printer - 1 piece; f) medium monochrome laser printer - 1 item; g) monochrome laser printer
(Alliance News) - Clear Leisure PLC said Friday it has agreed to acquire the remaining 50% stake in a cryptomining joint venture from partner 64Bit Ltd for a nonimal sum of EUR1.
[!] PC Guard Win64/.NET64: Fixed problem with "Limit number of application instances" feature on some 64bit operating systems (std error was displayed).
Wirecast Gear is built on a Windows 10 Pro 64bit platform with i7 Intel processors, 16GB of memory and a 250GB system drive.
With 64bit desktop-class architecture, the A9 chip brings you spectacular speed and responsiveness.
For Era 4K, being yet another flagship for the Era series, Bhawna Agarwal, Chief Executive Officer, Gadgets360.com stated - "After the tremendous success of XOLO Era HD, XOLO and Gadgets 360 have now partnered again for the next killer device, a sub 6500 phone which has a powerful 4000mAh battery, fast 4G connectivity, 2GB RAM and 1.0Ghz, 64bit Quad Core processor, apart from other great features."
Broadcom Corporation (NASDAQ: BRCM) has released its first 64bit quad-core processor for high-end routers, the company said.
TELECOMWORLDWIRE-January 5, 2016-Broadcom introduces 64Bit quad-core router processor
It is also capable in network planning optimised for virtually all major Wi-Fi systems and is compatible with operating systems such as Windows 10 (32bit, 64bit), Windows 8 (32bit, 64bit) and Windows 7 (32bit, 64bit).
'Kabini' PC config is based off the 'Larne' reference design with 2013 AMD A4-5000 with AMD Radeon HD 8330 graphics, 4G DDR3 1600 and Windows 8 64bit. 'Brazos' PC config is based off the 'Renmore' reference resign with 2012 AMD E2-2000 with AMD Radeon HD 7340 graphics, 4G DDR3 1333 and Windows 7 Ultimate.
warranty, and includes Windows 2008 Server R2, Foundation Edition, 64Bit,