Question : What are these PCB connectors “formally” called?
I have no luck finding these in any distributor catalogue….
Please have a look at this photo http://www.east-west-exchange.com/Edge.pdf
So the motherboard has just square wire pins standing vertically, and then this daughter board plugs into them.
But where to get those “females”?
Note: This board was made in the UK many years ago…..
pcb connectors

Best answer:

Answer by Kevin M
Hmm…I’ve seen a lot of things, but can’t say I’ve ever seen anything quite like that. Maybe you can make it work using a right angle MTA female (see Tyco AMP connectors). They’re for .025″ pins, but on 0.100″ centers. You could just skip every other one, or pull the contacts out of the connector for the ones you don’t need.

Sorry I don’t have the right answer, but hope this helps you anyway.