Hi!
This is the story and (aiming to be) the definitive article on the IBM Model M4 and M4-1 Space Saver buckling sleeves keyboards, the keyboard that came before and largely inspired the first generation of ThinkPad keyboards (the Model M6).
Well... sort of. The story is a bit more complex but everything is explained inside! This has been one of the largest undertakings for my website, being over a month in the making, and features contributions from several awesome people! All contributions are acknowledged at the end. The motivation for this was that there is seldom (centralised) information about these keyboards. They're not particularly rare nor unheard about, but in my time looking up these keyboards, I noticed a fair few misconceptions and a lot of questions gone unanswered. Being someone who particularly loves these sorts of nichés and nuances, I thought this would be a cool thing to write about.
The article:
https://sharktastica.co.uk/articles/m4_storyEnjoy!
