The LARC was a decimal mainframe computer with 48 bits per word. It used bi-quinary coded decimal arithmetic with four bits per digit, allowing for 11-digit signed numbers. Instructions were 48 bits long, one per word. Every digit in the machine had one parity bit for error checking, meaning every word occupied 60 bits (48 bits for data with 12 bits for parity check). The basic configuration had 26 general-purpose registers, which could be expanded to 99. The general-purpose registers had an access time of one microsecond.
