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Reverse side of the same 402 plugboard, showing the pins that make contact with the machine's internal wiring. The holes were called hubs. A plugboard or control panel (the term used depends on the application area) is an array of jacks or sockets (often called hubs) into which patch cords can be inserted to complete an electrical circuit.
IEC 60417-5008, [7] the power-off symbol (circle) on a button or toggle, indicates that using the control will disconnect power to the device. (0 or means off.) IEC 60417-5009, [8] the standby symbol (line partially within a broken circle), indicates a sleep mode or low power state. The switch does not fully disconnect the device from its power ...
Wire crossover symbols for circuit diagrams. The CAD symbol for insulated crossing wires is the same as the older, non-CAD symbol for non-insulated crossing wires. To avoid confusion, the wire "jump" (semi-circle) symbol for insulated wires in non-CAD schematics is recommended (as opposed to using the CAD-style symbol for no connection), so as to avoid confusion with the original, older style ...
The second is a link to the article that details that symbol, using its Unicode standard name or common alias. (Holding the mouse pointer on the hyperlink will pop up a summary of the symbol's function.); The third gives symbols listed elsewhere in the table that are similar to it in meaning or appearance, or that may be confused with it;
See also References External links A Accelerated Graphics Port (AGP) A dedicated video bus standard introduced by INTEL enabling 3D graphics capabilities; commonly present on an AGP slot on the motherboard. (Presently a historical expansion card standard, designed for attaching a video card to a computer's motherboard (and considered high-speed at launch, one of the last off-chip parallel ...
A kind of text display vacuum tube that used an internal element to shape an electron beam to represent the shape of letters and other symbols. charge pump A DC to DC converter circuit that uses capacitors to store energy between stages. charge transfer switch A kind of charge pump circuit. charge-coupled device
SCSI—Small Computer System Interface; SCTP—Stream Control Transmission Protocol; SD—Secure Digital; SDDL—Security Descriptor Definition Language; SDH—Synchronous Digital Hierarchy; SDI—Single-Document Interface; SEC—Single Edge Contact; SDIO—Secure Digital Input Output; SDK—Software Development Kit; SDL—Simple DirectMedia Layer
Colossus K2 switch panel showing switches for specifying the algorithm (on the left) and the counters to be selected (on the right) Colossus 'set total' switch panel. Howard Campaigne, a mathematician and cryptanalyst from the US Navy's OP-20-G, wrote the following in a foreword to Flowers' 1983 paper "The Design of Colossus".