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Apple offered an EmPower MagSafe power adapter for their MacBook, MacBook Pro, and MacBook Air lines of notebooks, and also included a cigarette lighter socket adapter. However, this system would only run the computer without charging the computer's battery, and Apple warned users to never plug this device into a car's cigarette lighter outlet. [5]
The Bus Pirate can communicate via the following serial protocols, with line levels of 0–5.5 volts: 1-Wire, I²C, SPI, JTAG, asynchronous serial, and MIDI. It can receive input from a keyboard, and can output to a Hitachi HD44780 LCD controller. Other features: UART; 2- and 3-wire libraries with bitwise pin control; 0 – 6 volt measurement probe
A simple voltage dropper can be used to reduce the voltage for low-power devices; if more than 12V is required, or for high-powered devices, a switched-mode power supply is used. The output will usually be DC in the range 1.5–24 V. Power supplies that output either 100–120 V AC or 210–240 V AC are available; they are called inverters ...
It supplied two other voltages, −5 V and −12 V, but with limited amounts of power. Most microchips of the time operated on 5 V power. Of the 63.5 W these PSUs could deliver, most of it was on this +5 V rail. The +12 V supply was used primarily to operate motors such as in disk drives and cooling fans.
The result is a frequency compensated probe for modest frequencies that presents a load of about 10 megohms shunted by 12 pF. Although such a probe is an improvement, it does not work when the time scale shrinks to several cable transit times (transit time is typically 5 ns).
U.S. flags are set to be flown at half-staff to honor the death of former President Jimmy Carter.
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