VAX is a 32-bit computing architecture that supports an orthogonal instruction set (machine language) and virtual addressing (i.e. demand paged virtual memory). It was developed in the mid-1970s by Digital Equipment Corporation (DEC).
Generic Linux support
Generic work is in progress to port Linux to the VAX architecture. Currently a 2.6 kernel is mostly up and running, but userland is lagging behind. There is only a very experimental static and/or shared uClibc userland at this time. A working toolchains is based on old tools (gcc 2.95).
The Linux/VAX developpers are working on getting more up-to-date tools up and running, but progress has stalled.
TA-Linux support
There is an experimental uClibc based shared library TA-Linux userland, but it's incomplete and has many bugs and is based on the old toolchain and has not been tested with 2.6 kernels.