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The first types of small modular telephone connectors were created by AT&T in the mid-1960s for the plug-in handset and line cords of the Trimline telephone. [1] Driven by demand for multiple sets in residences with various lengths of cords, the Bell System introduced customer-connectable part kits and telephones, sold through PhoneCenter stores in the early 1970s. [2]
This thin wire is well-suited for coiling embellishments. 16-gauge wire is good for making jump rings and links for necklaces and bracelets, and 18-gauge wire is good to use for adding embellishments and making finer links. Memory Wire is a rigid, pre-coiled wire that makes it easy to create finger and toe rings, bracelets and necklaces.
The separate program memory and data memory were operated in antiphase, with the addressing phase of Program Store coinciding with the data fetch phase of Call Store and vice versa. This resulted in further overlapping, thus higher program execution speed than might be expected from the slow clock rate. Programs were mostly written in machine code.
A SP1 2-wire variant was also available that provided Centrex services. A version of the SP-1 ESS that could provide both 2 & 4 wire services was also built. The first instance was installed in Vegreville Alberta in 1976 or 1977. SP1 4-Wire (Toll) The first example of this switch was installed for Bell Canada, in Thunder Bay, Ontario in late 1973.
Mechanical wire wrap tool Electrical wire wrap tool; pneumatic (air-powered) tools are also available. A "wire wrap tool" has two holes. The wire and 1 ⁄ 4 in (6.4 mm) of insulated wire are placed in a hole near the edge of the tool. The hole in the center of the tool is placed over the post.
Delay-line memory is a form of computer memory, mostly obsolete, that was used on some of the earliest digital computers, and is reappearing in the form of optical delay lines. Like many modern forms of electronic computer memory, delay-line memory was a refreshable memory , but as opposed to modern random-access memory , delay-line memory was ...
Plated-wire memory has been used in a number of applications, typically in aerospace. It was used in the UNIVAC 1110 and UNIVAC 9000 series computers, the Viking program that sent landers to Mars , the Voyager space probes, [ 3 ] a prototype guidance computer for the Minuteman-III , the Space Shuttle Main Engine controllers , [ 4 ] the KH-9 ...
For this reason, later core systems combined the two into a single wire, and used circuitry in the memory controller to switch the function of the wire. However, when Sense wire crosses too many cores, the half select current can also induce a considerable voltage across the whole line due to the superposition of the voltage at each single core.