To use PicToBrick you need a runtime environment – the JAVA Virtual Machine (in short JAVA VM or JVM) from version 5 (Sometimes you find the version number 1.5 on these versions! The versions 5 and 1.5 are identical.) The JVM is used as interface between PicToBrick and the operating system of your computer. PictoBrick is a software in JAVA bytecode. Windows 98, Windows ME, Windows 2000, Windows XP, Windows 2003.Interpreter: Sun Java Virtual Machine (Runtime Environment) from version 5.0 ( Download from Supported operating systems.Screen resolution: 1024x768 pixel (Windows and Linux), 1280x854 pixel (Mac OS).The more powerful the processor is the faster the algorithms work to generate the mosaic. Processor: the capacity of the processor is in principal irrelevant for the functioning of the software.Memory: 256 MB (the more main storage is available the bigger are the pictures and mosaics that can be constructed.).