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The first relational database program for the PC, RBASE, was written on a Heathkit CPM computer at home by Wayne Erickson in 1981. Wayne and his brother, Ron Erickson, created the company MicroRim, Inc. to sell the database, then named "MicroRim." The earliest released version was named "R:Base 4000" and was released in 1983 for MS-DOS and IBM PC DOS. R:Base 4000 had many features and was easy-to-use, but fell behind dBase in the market due to its lack of a complete programming language. However, the program was quickly updated with Added Variables and a conventional programming language as Version 1.1 in 1984. After this, R:Base was second only to dBase in the market. In 1985, R:Base 5000 was released, with wider acceptance and much improved features. 1987 saw the release of R:Base 2.0, gaining better documentation, a new file format, and higher memory capabilities. R:Base 3.0 was released in 1990 and was ANSI SQL compliant and utilized the DOS4GW memory manager, much like many DOS games of the era. The 3.1 update added multi-user network capability with purchasable license packs. R:Base 4.0 included a newer file format, memory management, and more recent processor support; it was released in 1992. 4.0 came with a copy of 3.1 to support legacy customers and claimed to support 2GB data files. R:Base 4.5 came with another file format and much improved capacity. 4.5 claimed that the number of records was "limited only by disk space." R:Base for Windows was rolled out in 1994 and was fully compatible with R:Base 4.5 files. Documentation claimed it would run on Windows 3.1, Windows 95, or Windows inside OS/2 Warp version 3. R:Base has released working copies on current machines.