offering the Unix support never delivered for Acorn's 32016-based systems. The Torch Unicorn was perhaps the clearest realisation of the broader "Universal Gluon" concept, effectively coupling a BBC Micro with a more powerful computing system. Initially mentioned as a "CAD graphics workstation based on the 16032 chip" in October 1983, and presumably following on from work done by Acorn related to the design of the ULA components in its products, the Acorn Cambridge Workstation formed the hardware basis of a chip design product by Qudos called Quickchip, "a comprehensive CAD package for semi-custom gate arrays... supported by a high speed direct write electron beam fabrication facility", used by custom semiconductor product designers such as Flare Technology and promoted by the UK's Department of Trade and Industry. A related product was apparently produced by Qudos for the BBC Master Turbo or BBC Micro with 6502 second processor expansion, offering design support for custom gate arrays of "up to around 300 gates in size" based on Ferranti ULA technology. Quickchip was subsequently ported to the Acorn Archimedes, with the software having previously been "running on powerful Unix workstations". Although the smaller-scale Minichip solution ran on a BBC Micro-based system with 6502 coprocessor, and was also released for the Archimedes, the Unix-based Quickchip solution apparently ran on Vax systems running Ultrix. Having promised some kind of Unix product as early as 1982, Acorn eventually released a Unix workstation in 1989 based on the Archimedes hardware platform, followed up by other models in 1990. Instead of Xenix, these workstations ran RISC iX: a port of 4.3BSD Unix to the ARM architecture. Despite the ABC 300 series embracing compatibility with the IBM PC world, Acorn would subsequently mostly avoid selling dedicated PC compatibles, with the Acorn M19 - a rebadged Olivetti M19 - appearing in the product range for a short period in the mid-1980s. Beyond the Master 512, the Archimedes range was initially intended to support a similar second processor expansion, but PC support on the Archimedes range initially focused on software emulation with the PC Emulator product. Eventually, hardware expansions from Aleph One provided the envisaged second processor capabilities, these being sold by Acorn in some configurations for certain models. Acorn would go on to emphasise PC compatibility with the Archimedes' successor, the Risc PC, with its architecture supporting a plug-in Intel-compatible CPU alongside the main ARM processor. Eventually yielding to demands for