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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 ...
The official size for British postcards between 1894 and 1899, measuring 115 mm × 89 mm (4.5 in × 3.5 in). Divided Back Postcards with a back divided into two sections, one for the message, the other for the address. British cards were first divided in 1902 and American cards in 1907. [48] Early
It had a full-size keyboard (with separate numeric keypad) and a large amber LCD screen. While it was offered with dual 3.5-inch floppy disk drives, the most common configuration was a 20 MB hard drive and a single floppy drive. It was one of the first machines with a 1.44 MB density 3.5-inch disk drive.
5V DC and 9V AC from an external "power brick", attached to a 7-pin female DIN-connector on the computer. [ 107 ] The 9 volt AC is used to supply power via a charge pump to the SID sound generator chip, provide 6.8V via a rectifier to the cassette motor, a "0" pulse for every positive half wave to the time-of-day (TOD) input on the CIA chips ...
In Czechoslovakia, the first production ZX Spectrum clone was the Didaktik Gama, sporting two switched 32 KB memory banks and 16 KB of slower RAM containing graphical data for video output, followed by Didaktik M, with later availability of a 5.25"/3.5" floppy disk drives; and a Didaktik Kompakt clone with a built-in floppy drive. [154]
The signatures of a book can also be held together by "Smyth sewing" using needles, "McCain sewing", using drilled holes often used in schoolbook binding, or "notch binding", where gashes about an inch long are made at intervals through the fold in the spine of each signature. The rest of the binding process is similar in all instances.
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