latest technology, relatively little software for the C128's native mode appeared (probably on the order of 100–200 commercial titles, plus the usual share of public domain and magazine type-in programs), leading some users to regret their purchase. While the C128 sold a total number of 4 million units between 1985 and 1989, its popularity paled in comparison to that of its predecessor. One explanation for these lower sales numbers may be because the C64 was sold to people primarily interested in video games, which the more expensive C128 didn't add much value towards improving. Some C64 software such as Bard's Tale III and Kid Niki ran in 128 mode without stating this in the documentation, using the autoboot and the 1571's faster disk access. Some Infocom text adventures took advantage of the 80-column screen and increased memory capacity. Some C64 games were ported to native mode like Kikstart 2 and The Last V8 from Mastertronic, which had separate C128 versions, and Ultima V: Warriors of Destiny from Origin Systems, which used extra RAM for music if running on the C128. Star Fleet I: The War Begins from Interstel had separate versions, and took advantage of 80-column display on the C128. The vast majority of games simply ran in C64 mode. By contrast, many C64 productivity software titles were ported to the C128, including the popular PaperClip and Paperback Writer series. This software used the extra memory, 80-column screen, enhanced keyboard and large-capacity disk drives to provide features that were considered essential for business use. With its advanced BASIC programming language, CP/M compatibility and "user-friendly" native software packages such as Jane, Commodore attempted to create a low-end business market for the C128 similar to its strategy with the Plus/4, even distancing itself from the home computer label by branding the C128 a "Personal Computer" on the case. Significantly, the C128 was the first Commodore computer to advertise its use of Microsoft BASIC, where the Microsoft name would have been a competitive asset. The C128 was certainly a better business machine than the C64, but not really a better gaming machine. People who wanted business machines bought IBM PC clones almost exclusively by the time the C128 was released. The availability of low-cost IBM compatibles like the Leading Edge Model D and Tandy 1000 that, in some cases, sold for less than a complete C128 system derailed Commodore's small business computer strategy.