Unicomp buckling contact keyboard. Clicker type

[calexanian]

The original apple keyboard was a datanetics keyboard. Many terminals in the 70's used them and that is actually where we found that Veetronix switch. We used them for about 15 years in our products and NEVER had to replace one from failure from regular use. We only used perhaps three or four thousand per year but they were very reliable.

[Don Hills]

Model F's put model M's to shame. They use capacitive sensing so there's no contacts to oxidize or wear.  Also, there's no limit to the # of keys that can be pressed simultaneously without any getting missed. ...

Not unlimited. 4 key rollover, if I recall correctly, like the predecessor 3270 terminal keyboards. (I used to fix them. I carried spare flyplate modules in my toolbag.)

[nidlaX]

The original apple keyboard was a datanetics keyboard. Many terminals in the 70's used them and that is actually where we found that Veetronix switch. We used them for about 15 years in our products and NEVER had to replace one from failure from regular use. We only used perhaps three or four thousand per year but they were very reliable.

Did those Datanetics keyboards use the Veetronix switch? I thought they used a Datanetics patented switch which is not a reed mechanism. Also, those Veetronix switches list an operating life of 50 million cycles, which is just on par with Cherry MX.

Model F's put model M's to shame. They use capacitive sensing so there's no contacts to oxidize or wear.  Also, there's no limit to the # of keys that can be pressed simultaneously without any getting missed. ...

Not unlimited. 4 key rollover, if I recall correctly, like the predecessor 3270 terminal keyboards. (I used to fix them. I carried spare flyplate modules in my toolbag.)

4 key rollover when used with a PC? I'm pretty sure it's N-key. It may depend on the particular controller implementation as well as the terminal.