While early versions of Arnold were written using x86 assembly, more recent versions are written in portable C. This resulted in ports for MacOS, MacOS X, Linux, Unix and other platforms. While every port of Arnold has its own native user interface, the emulation core remains the same across the different versions.
Arnold is being actively developed. The work in progress version uses SDL for the display, audio and input and wxWidgets for the GUI. It is being developed using Code:Blocks, and now both the Linux and Windows version have identical functionality and have the same interface.
Initially the lead platform was windows, now it is the linux version with the Windows version being generated by cross compiling.
== Web links ==