Sir Clive Sinclair's Cambridge Computers Ltd is to launch an IBM-compatible portable in April that will undercut Psion Plc's equivalent offering by around 50%: the portable will have a single Citizen 3.5" floppy drive and will be available with 20Mb and 40Mb hard disks from Conner Peripherals Inc; it uses magnesium alloy casing to get weight down to just 3 lbs, is A4 size and prices will start at UKP700.