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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 ...
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 ...
The Amstrad PC20 / Sinclair PC200 was a home computer created by Amstrad in late 1988, based on the Amstrad PPC 512 hardware. The machine was available in two versions, Sinclair PC200 and Amstrad PC20. The PC200 [1] [2] had a black case and 'Sinclair' branding, while the PC20 [3] was white and branded 'Amstrad'. [4]
STORY: (Tim Persky, Floppy disk seller)"If you think this is old, take a look at this. This is a floppy disk from the 1970s."This man is believed to be the world's last known bulk supplier of ...
Schneider-badged version of the Amstrad 1512 DD Amstrad PC-1512 DD on display at Retrosystems 2010. General hardware specifications of the PC1512: Available as choice of one or two 360 KB 5¼-inch floppy disks drives or one floppy disk drive with a 10 or 20 MB hard disk drive.
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 ZX Spectrum +2 ...