Less than a year after its release, Psion's Organiser has found a home in the pockets of specialists. Software launched last week, makes the "world's first practical pocket computer" less of an overblown calculator.

The new products include Medipak, a drug enquiry system for non-specialist staff, which holds data on 750 brand name drugs and can search for generic names and symptoms etc, with wild-card matching.

The Wessex Material Computer is a materials-costing package for the construction industry. Given dimensions, materials and prices, it calculates material overheads.

Peripherals for existing Organisers include bar-code and credit card readers, RS232 communication and 32K packs.

Psion has also produced a credit card validation scheme for Marks and Spencer, which has bought 3,700 modified Organisers. ROM cartridges will contain numbers of invalid or overdrawn cards.

For third parties, Psion is offering a Forth development system for IBM PCs, with training and technical back-up included in the £500 price tag.

Could Psion be moving away from Sinclair? A spokesman denied this, but the Organiser contracts announced totalled "well in excess of £1m"; Psion claims to have sold 2,000 Organisers in the eight months following its release, and production is running at 3,000 units per month.