as the command-line interpreter. The QL is bundled with an office suite, consisting of a word processor, spreadsheet, database, and business graphics written by Psion. It is the first OS to feature a Windows-style GUI, predating Apple Computer by a month. Legacy ICL One Per Desk The QL's CPU, ZX8301 and ZX8302 ASICs and Microdrives form the basis of One Per Desk (OPD). Built by International Computers Limited (ICL), it was also marketed by British Telecom as the Merlin Tonto and by Telecom Australia as the Computerphone. The result of a three-year collaboration between Sinclair Research, ICL and British Telecom, the One Per Desk adds a telephone handset at one end of the keyboard, and rudimentary Computer-Telephony Integration (CTI) software. This machine interested a number of high-profile business customers, including certain divisions of the former UK Customs and Excise Department, but its success was generally limited. In the late 1980s they were used in bingo halls to allow a country-wide networked bingo game. Linux Linus Torvalds has attributed his eventually developing the Linux kernel, likewise having pre-emptive multitasking, in part to having owned a Sinclair QL in the 1980s. Because of the lack of support, particularly in his native Finland, Torvalds became used to writing his own software rather than relying on programs written by others. His frustration with the Sinclair led, years later, to his purchase of a more standard IBM PC compatible on which he would develop Linux. Clones After Amstrad abandoned the QL in 1986, several companies previously involved in the QL peripherals market stepped in to fill the void. These included CST and DanSoft, creators of the Thor line of compatible systems; Miracle Systems, creator of the Gold Card and Super Gold Card processor/memory upgrade cards and the QXL PC-based hardware emulator; and Qubbesoft, with the Aurora, the first replacement QL mainboard, with enhanced graphics modes. In the late 1990s, two partly QL-compatible motherboards named Q40 and Q60 (collectively referred to as Qx0) were designed by Peter Graf and marketed by D&D Systems. The Q40 and Q60, based on the Motorola 68040 and 68060 CPUs respectively, are much more powerful than the original QL and have the ability among other things (such as multimedia, high resolution graphics, Ethernet networking etc.) to run the Linux operating system. In 2013 Peter Graf announced that he was working on the Q68, a FPGA based QL compatible single board computer.