The Electronic Chess Mark 8 bears an uncanny resemblance to the Concord and Concord II. It is assumed that it is a Concord-a-like in terms of technical specification. If so it probably has the Kaare Danielsen 4K program. Scisys claim that it is capable of Mate In 4, so it is unlikely that it has a weaker program or specification.
Opening up the Mark 8 reveals a SciSys custom singlechip (0609V171) as you would expect.