I cannot think of any instrument that would have been abbreviated EAS. I suspect that was the initials of the person who administered it. Back in the day, when I pulled permanent student records, some districts had assessment record cards that would have lines like that. Usually the name of the instrument, followed by a score ("IQ=102"), and then the initials or first initial and last name of the person who completed the assessment.
In the 1986-1987 school year, a common instrument could have been the Stanford-Binet 4th edition, which had just been released, or the WISC-R, which was about a decade old at the time. It's possible this score was from one of the old versions of the CogAT, although it wouldn't technically have been considered a measure of intellectual ability. That wouldn't stop a district from labelling it that, of course.