What is SpaceFN and why you should give it a try
The SpaceFN concept - setting up your space key as a layer switch when held - is probably one of the most useful tweaks in the keyboard hobby. Let me explain how it works. My SpaceFN article on kbd.news made some rounds recently - quite surprisingly given the age of this concept. This piece you're reading is a condensed version of the full post. If you're left with unanswered questions, you'll most likely find the info you're looking for in the original write-up. On my imaginary top list of the most useful keyboard features, tweaks and hacks, SpaceFN would deserve a podium finish for sure. But what makes it so special? In short: SpaceFN is easy to implement, easy to learn, costs nothing, can be used with any keyboard, and can improve your productivity instantly. I will list its benefits below, but can state right at this point that the SpaceFN concept, setting up your space key as a layer switch when held, is clearly one of the most useful tweaks in the keyboard hobby....
Apr 30, 2024
0) the originator, 悬壶济世 is on the Chinese EnjoyClick.org website, the Chinese equivalent of GeekHack, and this was only launched last August as a Chinese group buy. And there are FOUR models... (technically 5, but...)
1) Red Scarf II+ "Model F", a layout that's... inspired by an IBM Model F Keyboard (aka the IBM PC XT keyboard, with numpad and 10 F keys on the left) (And even this was available as Winkey and Winkeyless versions...) If you can't quite visualize it...
3) Ver. C -- The RS 68, the RS 78 minus the F keys to the left
4) Ver. D -- a 77 key, this one is like a 60 key w/ arrow keys and a numpad (but no F-keys). It's weird enough I'll have to show you a photo:
Needless to say, all photos from Enjoyclick. http://www.enjoyclick.org/forum.php?mod=viewthread&tid=10324 Without logging in you can't see the pictures though. And it'd obviously be in Chinese. 5) I searched for the Model F and Ver. D and neither is available on Taobao, it may no longer be available "ever again".
and here is some info on them on Geekhack https://geekhack.org/index.php?topic=74400.0