I'm changing my answer... Visonic DT still late 80's
The pic need rotating to the right, the jumper between pyro & leds is marked "m/w"
Dt bit is the flat pcb type
looks right old.,...
pulse count, no. of pulse of movement before the alarm relay opens
memory - I assume a latch indication if multi sensors where on one circuit
rather than a large display keypad with 16 ohm speaker which does all the tone (set/ unset, chime ect...)
you have a small display keypad with a "speaker" connected to the programmable output ?