very rightmost memory location where you want the last character of the record to be located. A two-digit 'B' address also allows the modification of any instruction. Instruction codes and memory designations excluded the use of 8's or 9's. The first RCA business application was implemented in 1962 on a 4k RCA 301. The RCA 301, mid-frame 501, and large frame 601 began their marketing in early 1960.

Many kinds of users are found within the business environment, and can be categorized by using a small, medium, and large matrix: