64-BIT
\sˈɪkstifˈɔːbˈɪt], \sˈɪkstifˈɔːbˈɪt], \s_ˈɪ_k_s_t_i_f_ˈɔː_b_ˈɪ_t]\
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A term describing a computer architecture basedaround an ALU, registers and data bus which are 64bits wide.64-bit processors were quite common in 1996, e.g. DigitalAlpha, versions of Sun SPARC, MIPS, IBM AS/4000.the PowerPC and Intel were expected to move to 64 bits attheir next generation - PPC 620 and Intel P7.A 64-bit address bus allows the processor to address 18million gigabytes as opposed to the mere 4 gigabytes allowedwith 32 bits. There were in 1996 already hard disks whichcan hold over 4GB. Floating point calculations can also bemore 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). A32-bit OS can run on a 64-bit CPU.
By Denis Howe
Word of the day
Proto Oncogene Proteins c erbB 2
- cell surface protein-tyrosine kinase that is found to be overexpressed in significant number adenocarcinomas. It has extensive homology can heterodimerize EGF EPIDERMAL GROWTH FACTOR), 3 receptor (RECEPTOR, 3) and the 4 receptor. Activation of erbB-2 receptor occurs during heterodimer formation with a ligand-bound erbB family members. EC 2.7.11.-.