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  2. Floppy disk variants - Wikipedia

    en.wikipedia.org/wiki/Floppy_disk_variants

    A Maxell-branded 3-inch Compact Floppy Disk. The floppy disk is a data storage and transfer medium that was ubiquitous from the mid-1970s well into the 2000s. [1] Besides the 3½-inch and 5¼-inch formats used in IBM PC compatible systems, or the 8-inch format that preceded them, many proprietary floppy disk formats were developed, either using a different disk design or special layout and ...

  3. List of floppy disk formats - Wikipedia

    en.wikipedia.org/wiki/List_of_floppy_disk_formats

    3 inch Double 2 80 9 512 720 kB 300 MFM 720 kB mode uses both sides - ensure disc inserted correct way up. Apple II: 5 1 ⁄ 4 inch Double 1 35 13 256 soft 113.75 kB 300 GCR [NB 2] 1 16 140 kB 3 1 ⁄ 2 inch Double 1 80 Variable (8-12) 512 400 kB 394 - 590 GCR [NB 3] 2 800 kB High 2 80 18 512 1,440 kB 300 MFM [NB 4] Apple Lisa: 5 1 ⁄ 4 inch ...

  4. 4-bit computing - Wikipedia

    en.wikipedia.org/wiki/4-bit_computing

    The HP Saturn processors, used in many Hewlett-Packard calculators between 1984 and 2003 (including the HP 48 series of scientific calculators) are "4-bit" (or hybrid 64-/4-bit) machines; as the Intel 4004 did, they string multiple 4-bit words together, e.g. to form a 20-bit memory address, and most of the registers are 64 bits wide, storing 16 ...

  5. IBM 704 - Wikipedia

    en.wikipedia.org/wiki/IBM_704

    Designed by John Backus and Gene Amdahl, it was the first mass-produced computer with hardware for floating-point arithmetic. [1] [2] The IBM 704 Manual of operation states: [3] The type 704 Electronic Data-Processing Machine is a large-scale, high-speed electronic calculator controlled by an internally stored program of the single address type.

  6. Honeywell 6000 series - Wikipedia

    en.wikipedia.org/wiki/Honeywell_6000_series

    An eight-bit Exponent Register contained the exponent for floating point operations (the mantissa was in AQ). There were eight eighteen-bit index registers X0 through X7. [10] The 18-bit Base Address Register (BAR) contains the base address and number of 1024-word blocks assigned to the program (the 6180 used segmentation rather than the

  7. 128-bit computing - Wikipedia

    en.wikipedia.org/wiki/128-bit_computing

    The Siemens 7.700 and 7.500 series mainframes and their successors support 128-bit floating-point arithmetic. [4] Most modern CPUs feature single instruction, multiple data (SIMD) instruction sets (Streaming SIMD Extensions, AltiVec etc.) where 128-bit vector registers are used to store several smaller numbers, such as four 32-bit floating ...

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