Fur trade marten furs could generate in international markets spurred a "fur fever" in which many Russians moved to Siberia as independent trappers. From 1585 to 1680, tens of thousands of sable and other valuable pelts were obtained in Siberia each year. The primary way for the Muscovite state to obtain furs was by exacting a fur tribute from the Siberian natives, called a "yasak". "Yasak" was usually a fixed number of sable pelts which every male tribe member who was at least fifteen years old had to supply to Russian officials. Officials enforced "yasak" through coercion and by taking hostages, usually
PC Paintbrush 1988, allowing 256 colors and extended SVGA resolutions were supported through the use of hundreds of custom-tailored graphics drivers. The PCX format grew in capability accordingly. By its final version, "Paintbrush" was able to open and save PCX, TIFF, and GIF files. PC Paintbrush IV was released in 1990. PC Paintbrush V+ came in 1992. PC Paintbrush for Windows 1.0 was adapted to the Windows 3.0 graphical environment in 1993. Support for 24-bit color and simple photo retouching tools were also added, as well as the ability to open more than one image at a time. The program also added