Abstract: A combination keyboard and mouse particularly suitable for electronic equipment (e.g. computer) which has at least two parts encompassing a keyboard, and having at least one movable keyboard part arranged on a support surface adapted to be gripped by one hand of a user to be moved on a support surface as a mobile keyboard part to generate pointing movement commands to cause movement of a pointing member on the computer. Specifically, data input keys on the movable keyboard are arranged in a generally QWERTY keyboard layout, wherein at least one data input key is located between the T and the Y keys.

Abstract: A combined keyboard and pointing system for use with a computer is disclosed. The system comprises a keyboard consisting of at least two keyboard parts for generating keying commands wherein substantially all keys of a standard QWERTY or DVORAK keyboard are located on the keyboard, equally distributed with about half the keys being on a first keyboard part and the other half of the keys on a second keyboard part. At least one of the first and second keyboard parts are adapted to be gripped by one hand of a user and be moved on support surface as a mobile keyboard part to generate pointing movement commands to cause movement of a pointing member on the computer. A transducer is used to detect relative movement or positioning of the mobile keyboard part relative to the support surface and a communication mens is provided for the first and second keyboard parts to send the pointing movement commands and the keying commands to the computer.

Abstract: Apparatus for timing and initiating a multi-shot blast is disclosed and claimed. The apparatus comprises a programming tool 16 for individually programming a plurality of electronic detonator arrangements 18.1 to 18.5 with delay time data relative to a common initiate command signal. The programmed electronic detonator arrangements 18.1 to 18.5 are all connected to a data communication cable 28 connected to a control unit 20. The control unit transmits the initiate command signal to all the detonator arrangements on the cable 28. Upon reception of the initiate command signal, the detonator arrangements start timing out their respective programmed delay times to cause their associated charges 12.1 to 12.5 to explode at the end of the delay times. The blast may be aborted by a disarm command on the cable 28 at any time before the initiate command signal is transmitted on the cable.