The ESQ-1 has a special SME interface for upgrading the sequencer memory.
For this, it offers some special pins which I want to explain first:
||Sequencer Memory Chip Select
||SEQ# feedthru (used for disabling the internal 8kB
of sequencer memory)
||signals SME presence to the DUART
BS1-0 switch between 4kB segments of sequencer memory
BS2 selects upper or lower 32kB segment
And here's the schematics: Pins which are not listed (21,23,24,26,41,42) are
unused - just leave them floating.
ESQ-1 Sequencer Memory Expansion