The top ad is dated 1981 and is for Bordermatics. They supplied local pubs & clubs with gaming machines, juke boxes, pool tables etc, and were located at 137 Lorne Street at the time.
I also have another ad of theirs from 1984 and by then they had relocated to 109 High Street, Lochee where they shared premises with Cherry Video rentals.
Bordermatics are still on the go, only now they are based in Broughty Ferry.
I suppose Hynd Bros have done a bit of business with Bordermatics over the years, their amusement arcade in Reform Street being the other ad, dated 1986.
As you can see, in '86 they were announcing the very latest in gaming machines - the Laser Disc System!