Abstract: An enclosure or chassis for a high-performance personal computer which is portable, provides easy access to its internal components for servicing, and provides mechanisms which allow peripheral devices such as hard disks, floppy disks and CD-ROM drives to be quickly and easily installed and removed. The chassis provides an efficient cooling mechanism so that a heat sink required for a high-performance processor can be smaller than would be the case without such efficient cooling mechanism. The chassis opens up into a top portion and a bottom portion. The top portion houses the peripheral devices, and the bottom portion houses the motherboard, power supply and cooling fans. A tamper switch is provided which monitors the state of the chassis (open or closed) and reports over a network whenever the chassis is opened. However, the computer can still be operated when the chassis is opened for inspection, service and repair.

Abstract: A card reader for reading data recorded on a magnetic stripe on a card includes a guide for guiding the card along a path past a transducer head. A gimbal arrangement mounts the head on the end of a mounting shaft which is journaled in the end of an arm for free rotation about an axis parallel to the stripe as it moves along the path. The arm swivels about a transverse axis perpendicular to the stripe and is biased to bring the head into the guide path through a head opening. The head has a leading bevelled surface so that a card inserted in the path will lift the head which will then ride firmly on the stripe. By virtue of the free rotation of the head about an axis parallel to the stripe, the device adjusts for any lack of parallelism between the head and the magnetic stripe.