Industry Connections - a microcomputer family tree
Sometimes, it's a small world.
Psion started out writing software for Sinclair machines, before going on to develop its Epoc operating system for its Organisers. This then became Symbian, which shipped on millions of Nokia phones. Acorn started a little side project working on RISC processors, which became ARM - the chip design on billions of mobile phones. Or see how Elliot and LEO - names from the 1960s - formed ICL, which in the mid 1980s was managed by Robb Wilmot who also had a hand in Sinclair Research, before heading off to manage Poqet Computers - a company founded by former employees of the legendary Fairchild Semiconductor, which gave rise to Intel and AMD, amongst others.
Some may wonder why Apple isn't considered as a hub, given its hagiographic status in the early microcomputer industry. Well, although it liked to claim that it was the top-selling and most-influential manufacturer, it wasn't, and whilst it did posess the computer that many companies wanted to clone - the Apple II - it otherwise appeared as quite insular. Few people seemed to leave it to start other companies, apart from its founders (although one of those was forced out) and in the period from 1977 to the end of the 1980s it didn't seem to buy up any other companies - or if it did, there were no press releases about it. Also, over the same period it only produced four products of note (although two of them were reasonably influential) - Apple II, Apple III, Lisa and Macintosh.