The Super Nintendo (Super Famicom) had several game cart releases...
With custom chips included to add various hardware features (aka 'coprocessor' and 'enhancement chips').
Currently, redguy is developing SA1 support for SD2SNES which is an advanced open source FPGA based SNES copier (flash cart).
The SA-1 core has reached private beta stage and SmokeMonster recently posted a video testing it, check this forum thread over at krikzz.com for more info.
Thanks goes to babayaga for the heads up.
NEWS SOURCE: SA1 support for SD2SNES... (via) EurAsia