It is big...

The daughter board on the left has a ROM that seems to hold the patterns.

It uses an SAA1043 universal sync generator.

A module can.

An 8085, 8155, and EEPROM. The 8155 contains 2K of RAM.

4012 110 10812 Digital Board For PM5515:

4012 110 11131 Multiburst Board For PM5515