The
NCR 315 Data Processing System, released in January 1962 by
NCR, was a second-generation
computer. All
printed circuit boards used
resistor-transistor logic to create the various logic elements. It used
12-bit slab memory structure using
core memory. The instructions could use a memory slab as either two
6-bit alphanumeric characters or as three
4-bit BCD characters. Basic memory was 5000 "slabs" of handmade core memory, which was expandable to a maximum of 40,000 slabs in four refrigerator-size cabinets. The main processor included three cabinets and a console section that housed the power supply, keyboard, output writer (an
IBM electric typewriter), and a panel of lights that indicated the current status of the program counter, registers, arithmetic accumulator, and system errors. Input/Output was by direct parallel connections to each type of peripheral through a two-cable bundle with 1-inch-thick cables. Some devices like
magnetic tape and the
CRAM were daisy-chained to allow multiple drives to be connected.