Development work on Sony's Memory Stick Rom platform has been slower than expected, with mass production of MS Rom products expected only after April or June.
The Japanese electronics giant is trying to rally developer support for its new removable, write-once flash-memory card format for playback only to win backing from companies wanting to distribute data such as music samples, games, books and maps. Users will not be able to change the contents and it is cheaper to produce on MS Rom than rewritable cards.
Only one company, Japan-based FueTrek, makes MS Rom products.
According to its marketing division manager Nori Imai three products are ready but are not widely available.
They are an interactive English-language learning text, a pocket dictionary and a Tokyo city map. FueTrek has an alliance with United States publisher Ryan McNally to produce MS Rom versions of its maps.
Mr Imai said: 'We are still looking for Hong Kong content providers. I think the most possible platform is on personal digital assistant and content such as learning materials and games might be very popular.'