Abstract: An improved reprogrammable memory device permits definition of a page within an array of memory cells which is variable in size, erasure of only that data contained within the defined variable page while uneffecting the remaining data in the array of memory cells and reprogramming the defined variable page.

Abstract: A personal computer system utilizes a simplified motherboard having connectors on the motherboard that are electrically connected to data, address, control, power and ground signals necessary for expansion and upgrade of the computer system and a riser card or cards having the desired interface connectors and logic circuits thereon. The present invention provides for operatively and removably coupling a plurality of I/O expansion cards, host local bus interfaces and future system upgrades for the computer system without burdening the base cost thereof. The computer system may be expanded or upgraded at any time during manufacture or in the field. A simple and low cost common motherboard is utilized in the manufacture of the computer systems, resulting in lower manufacturing costs. A base computer system may be easily upgraded when more features are desired.

Abstract: An apparatus and method for a computer system having at least two disk drives in a data storage system wherein data may be read from or written to the disk drives simultaneously during a load multiple operation. Data from the disk drives may be simultaneously loaded into two different memory buffers utilizing the maximum available I/O data bus bandwidth.