Andrew Henderson’s BeagleSNES emulator appliance now supports the BeagleBone Black in addition to the BeagleBoard XM. The Black is a cheaper alternative to the XM ($45 USD vs $149 USD for the XM) with different specifications and a smaller physical footprint designed to compete with the Raspberry PI.
Version 0.3 of BeagleSNES also resolves a few issues with GUIs and SRAM saves.
Development tools are included in the image if you’d like to modify BeagleSNES.
You can get source, pre-built images ready to place onto an SD card in your BeagleBone Black or XM from BeagleSNES.org