Abstract:
The present invention relates to a circuit that pulls down the power supply line in an electronic system to a low state when the electronic system is turned off. More specifically, the present invention is an active circuit that establishes a low impedance between a power supply line and a return line when a system's power is turned off, and establishes a high impedance between a power supply line and a return line when the system is turned on.
Abstract:
A method and apparatus of assuring uniqueness of identification numbers of bus devices connected to a bus. Each bus device has a current identification number. At each of the bus devices, an identification number is received on a bus and the bus is contended for based on the received identification number. If more than one bus device is detected contending for the bus, the current identification number of one of the bus devices is changed. Each of the bus devices compares the received identification number to the current identification number of the bus device. A bus device provides a match indication, including driving a signal, if the comparison produces a match. Each bus device includes a collision detector for detecting if more than one bus device is driving the signal.
Abstract:
A network (10) includes a repeater (12) that can service data devices that operate using different communications protocols. The data devices (18, 20, 22) couple to the ports (34) of the repeater (12), and operate using a first communications protocol in a first domain (14). The data devices (26, 28, 30) also couple to the ports (34) of the repeater (12) and operate using a second communications protocol in a second domain (16). Information on the operation of a port (34) may be displayed using one port indicator (202) or two port indicators (300, 302).
Abstract:
A reset circuit for a computer system having PCI chip set, the reset circuit for resetting a PCI data bus in the event of a warm boot in the computer system to prevent corrupt data files, the reset circuit including a logical AND gate with a first input connected to a cold boot reset pin of the PMC, and an output connected to a PCI data bus; a logical OR gate with a first input connected to the flush pin of the PMC and an output connected to a second input of the logical AND gate; an inverter with an input connected to the flush pin of the PMC; and a delay device connected between an output of the inverter and a second input of the logical OR gate.
Abstract:
In a computer system having a receiving computer and a source computer, a method for the remote flashing of the BIOS in the receiving computer including the steps of transferring the flash information from the source computer to the receiving computer, with the flash information including the flash code, the flash code instructions and an encrypted digital signature corresponding to the flash code. The receiving computer is operably placed in a secure mode. A hash value corresponding to the flash information is calculated, and the hash value from the flash information is decrypted. The flash code is validated by comparing the decrypted hash value of the flash information to the calculated hash value, and if validated, the BIOS if flashed with the new flash code.
Abstract:
An interactive apparatus for use with a computer, comprising a transceiver for two-way wireless communication with a plaything, the transceiver having terminals for connection to the computer, and a control device for causing the computer to send and receive information to and from the plaything via the transceiver to enable the plaything to provide interactive fantasy simulation of the behavior of a corresponding real-world object. In another aspect, the invention provides a method for enabling fantasy play using a computer and a plaything, comprising at the plaything, delivering output and receiving input associated with the fantasy play, and generating control signals at the computer for controlling the output based on the input, and by wireless communication sending the control signals from the computer to the plaything and sending the input from the plaything to the computer.
Abstract:
A method, apparatus and computer system for detecting the insertion of a medium in a medium drive, including applying energy to a drive motor of the medium drive; changing the state of a medium change signal, in response to the energy, to reflect the presence of a medium in the medium drive; and relaxing the energy before the drive motor turns.
Abstract:
The present invention relates to a fault tolerant system for providing power to a multiple central processing unit computer system. Three DC-DC converters, each sized for providing power to one central processing unit, furnish power to two central processing units through two power planes. Each DC-DC converter has an output voltage level selectable through a voltage identification signal. If the voltage identification signals of the converters match, identification logic couples the power planes together. If only one converter is available to power the two central processing units, a stopclock logic circuit alternatively places the central processing units in known stopclock modes. Thus, the single converter only has to fully power one central processing unit at any one time.
Abstract:
A method and apparatus for increasing system functionality through a predefined interface is disclosed. Signal lines which are not used or which are not used in certain modes are connected to an interconnection device instead of being connected to an interface wherein the output of the interconnection device is connected to the interface where such lines would have been connected. The interconnection device also has a set of inputs for receiving signals from a device providing the desired functionality. A controller chooses between the two sets of inputs to control what signal lines are connected to the predefined interface. Accordingly, during certain modes of operation, the added functionality from a device whose output is being switched into the interface can be supported. In one embodiment, speaker phone capability is provided for even though the predefined PCMCIA interface does not support such capability. The disclosed design continues to maintain capability with all systems adapted to be used with such predefined interface.
Abstract:
A n-key rollover keyboard having an application specific integrated circuit (ASIC) with a large number of pins, each pin directly connected to a key contact, with the other side of the key contact connected to ground. The direct wire arrangement allows use of a single sided circuit board. The keyboard has a reduced cost over prior n-key rollover designs by allowing removal of the series diodes and double sided circuit board.