Behind the ribbon cable its labelled "IN" other side is "OUT"
Socket has half the pins of a Disk Drive (10 pins), hand soldered assembly.
There are no part numbers so I haven't been successful with google
Printed on Card is: Tron Systems & TS/LM/2,0
dated: 1985
IC's are
ic1 Hex inverter, ic2 OCTAL TRANSPARENT LATCH WITH 3-STATE OUTPUTS, ic3 non inverting buffer
If I was to guess at it, i'm wondering if its a cash register controller card ? but definitely seems to
be able to control some kind of external hardware device
