I did some research on that board a while back. It's an Insight Enterprises EQ-4, from about 1983-1984. Apparently it was released, as an Argentinean wrote into Byte magazine in August 1985 asking for "[a]n Insight Enterprises EQ-4 single-board computer user to solve a problem."

There's even an IMP driver for the board http://oldcomputers.dyndns.org/public/pub/cdrom/walnut_creek_cdrom/cpm/imp/i2eq-4.asm