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Drawings from IBM Floppy Disk Drive Patents. IBM's decision in the late 1960s to use semiconductor memory as the writeable control store for future systems and control units created a requirement for an inexpensive and reliable read only device and associated medium to store and ship the control store's microprogram and at system power on to load the microprogram into the control store.
The floppy disk drives on these models were in the unusual 3-inch "compact floppy" format, [13] which was selected as it had a simpler electrical interface than 3½-inch drives. [33] In the range's early days supplies of 3-inch floppies occasionally ran out, [ 13 ] but by 1988 the PCW's popularity encouraged suppliers to compete for this market ...
The Amstrad CPC (short for "Colour Personal Computer") is a series of 8-bit home computers produced by Amstrad between 1984 and 1990. It was designed to compete in the mid-1980s home computer market dominated by the Commodore 64 and the ZX Spectrum; it successfully established itself primarily in the United Kingdom, France, Spain, and the German-speaking parts of Europe.
Amstrad PPC512, closed Amstrad PPC640. The two computers had very similar specifications. The PPC512 had an NEC V30 [1] [3] processor running at 8 MHz, 512 KiB of memory, a full-size 102-key keyboard with a numeric keypad, a built-in liquid crystal display (not backlit) [6] that could emulate the CGA or MDA [2] and either one or two 720k 3.5" floppy drives (the model was either the PPC512S or ...
Amstrad launched two new variants of the Spectrum: the ZX Spectrum +2, based on the ZX Spectrum 128, with a built-in cassette tape drive (like the CPC 464) and, the following year, the ZX Spectrum +3, with a built-in floppy disk drive (similar to the CPC 664 and 6128), taking the 3" disks that many Amstrad machines used.
The PC1512 shipped with one or two 360KB 5¼-inch floppy drives, and optionally a hard drive (10 or 20 MB). The 5¼-inch floppy drive(s) could be replaced with 1.2 MB capacity versions. The machine was also marketed as the Sinclair PC500. [7] Amstrad licensed both MS-DOS 3.2 and Digital Research DOS Plus, which was largely compatible with MS ...
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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; [4] [5] they became commercially available in 1971 as a component of IBM products and both drives and disks were then sold ...