Radius Inc. was an American computer hardware firm founded in May 1986 by Burrell Smith, Mike Boich, Matt Carter, Alain Rossmann and joined by other members of the original Macintosh team like Andy Hertzfeld. The company specialized in Macintosh peripherals and accessory equipment. It completed its IPO in June 1990. Their products included processor upgrade cards (Radius Accelerator) bringing Motorola 68020 processors to earlier Macintosh systems; graphics accelerators (Radius QuickColor); television tuners (RadiusTV); video capture cards (VideoVision); color calibrators (PrecisionColor); multi-processor systems (Radius Rocket) for 3D rendering and multiple OS sessions; high-end video adapters and monitors. History The first Radius product was the Radius Full Page Display, the first large screen available for any personal computer. First available for the Macintosh Plus, it pioneered the concept of putting multiple screens in a single coordinate space, allowing users to drag windows between multiple screens. This was a concept that Apple later incorporated into the Macintosh II. The firmware was written by Andy Hertzfeld while Burrell Smith developed the hardware. In its first 12 month of shipments, Radius achieved US$1-million per-month sales. The second Radius product was the Radius Accelerator, an add-on card that quadrupled the speed of the Macintosh by adding a Motorola 68020 processor. Another product was the Pivot Display: a full-page display that rotated between landscape and portrait orientation with real-time remapping of the menus, mouse and screen drawing. The award-winning product design was by Terry Oyama, former ID lead at Apple Computer. Radius's graphics accelerator products included the QuickColor and QuickCAD boards. Using an ARM processor, this being specifically the VL86C010 device also known as the ARM2 and used in the Acorn Archimedes series of computers, QuickColor offered a claimed 600 percent speed increase in screen drawing operations, although observed performance gains were more modest. Designed to work with products such as the Radius Color Display, the QuickColor was able to access the framebuffer of the display board at a much higher rate - by employing block transfers - than that achieved in an unaccelerated system utilising numerous separate data transfers over the NuBus expansion bus. Various "bottleneck" QuickDraw operations were implemented using routines running on the QuickColor board. Such reimplemented routines were claimed to run 50% faster on the QuickColor board whose ARM processor ran "a multi-tasking RISC operating system". QuickCAD was described as "a superset of Radius's QuickColor", offering display list processing in a fashion similar