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  2. List of floppy disk formats - Wikipedia

    en.wikipedia.org/wiki/List_of_floppy_disk_formats

    Double 1 40 9 512 180 kB 300 MFM Single head drive, but double-sided floppy discs (total of 360 kB per floppy) Amstrad PCW8512/9512: 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: 1 16 140 kB 3 1 ⁄ 2 inch Double 1 80

  3. Kaypro - Wikipedia

    en.wikipedia.org/wiki/Kaypro

    The Kaypro IV and later the Kaypro 4 have two double-sided disks. The Kaypro 4 was released in 1984, and was usually referred to as Kaypro 4 '84, as opposed to the Kaypro IV, released one year earlier and referred to as Kaypro IV '83. The Kaypro IV uses different screen addresses than the Kaypro II, meaning software has to be specific to the model.

  4. Floppy disk - Wikipedia

    en.wikipedia.org/wiki/Floppy_disk

    8-inch floppy disk, inserted in drive, (3½-inch floppy diskette, in front, shown for scale) 3½-inch, high-density floppy diskettes with adhesive labels affixed The first commercial floppy disks, developed in the late 1960s, were 8 inches (203.2 mm) in diameter; they became commercially available in 1971 as a component of IBM products and both drives and disks were then sold separately ...

  5. Timeline of binary prefixes - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_binary_prefixes

    "The drives are soft sectored, single or double sided, with 40 tracks per side. They are Modified Frequency Modulation (MFM) coded in 512 byte sectors, giving a formatted capacity of 163 840 bytes per drive for single sided and 327 680 bytes per drive for double sided." Seagate ST 506/412 OEM Manual

  6. Sanyo MBC-550 series - Wikipedia

    en.wikipedia.org/wiki/Sanyo_MBC-550_series

    The MBC-550 series, also known as the MBC-550/555, [1] [2] is a series of personal computers sold by Sanyo. It was unveiled at the COMDEX/Spring '83 in April 1983 and first released to market in March 1984. [3] [4] : 12 All models in the MBC-550 series featured pizza-box-style cases and Intel 8088 microprocessors and run versions of MS-DOS.

  7. HP LaserJet - Wikipedia

    en.wikipedia.org/wiki/HP_LaserJet

    The 8000 brought 1200x1200-dpi resolution, which was continued in the 8100 and 8150. The 8100 and 8150 brought faster printing (32 pages per minute), but this speed was only realized for single-sided (simplex) printing; double-sided printing remained at 24 pages per minute.

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