I can barely remember Howard Gayle 8 games on loan in 83, tho i never missed a game that season.
I remember Tony Cunningham, and a certain name directed at him, but I think his race didnt really come into the fact the fans just thought he was shit, and symptomatic of the poor first season back in the top flight playing hoofball under Jack Charlton.
The Newcastle crowd were just generally racist in the early/ mid 80s, names, monkey noises, bananas and songs, chants were quite common iirc. Im sure someone will be along to disagree- but thats how I remember it.
Casual racism was pretty much an accepted norm in the area where I grew up tbh.
It still is accepted as the norm in a lot of places in Newcastle.