(Valencia's Simple Tasker) was an operating system
with a microkernel
architecture, with all device drivers
and file systems
residing in userspace
mode. It is mostly POSIX
compliant, except when POSIX compatibility got in the way of extensibility and modularity. It was conceptually inspired by QNX
and Plan 9
. Written by Andy Valencia
, and released under the GPL
license. Currently the licensing for VSTa is Copyleft
VSTa was originally written to run on i386 hardware, but was subsequently ported to several different platforms, e.g. 68030 based Amigas.
VSTa is no longer developed, but its ideas and source code are being used in the FMI/OS operating system, which continues the cause of VSTa.
The default graphical user interface
provided as a tarball with the system was ManaGeR