ITT Courier review (Honeywell Hall effect D1B3S)

[XMIT]

Around 8:03 you say that these switches are impossible to open.

This is true. But, there is enough space for dirt to get in and out.

The key property of the Schmitt trigger is not its activation voltage or switching property, but hysteresis. It provides some "wiggle room" between low to high and high to low transitions. In effect, it helps to debounce the key switch, and/or makes it so that the actuation and deactivation point of the switch are not at exactly the same spot.

I actually mention both of these things in the video .

Yes you do, later on. A diagram of hysteresis would be a good thing to introduce in a later video. A Schmitt trigger exhibits electrical hysteresis but there are plenty of examples of mechanical hysteresis as well. The best one that comes to mind is the difference between make and break points on a Cherry MX Blue switch.

[Muirium]

I think I heard something about 4KRO for my terminal board. Which would be just fine by me. So long as I can chord mods and have a function layer, I'm good. But clearly the original terminals didn't ask much from these boards!

Also, not all rollover is alike. Every Model M is measly 2KRO: yet the SSK is brilliant and the the 122 key terminal boards are turds. The difference is the matrices. Regular Model Ms prioritized the mods. The terminal boards, ominously, did not.

[jacobolus]

That keyboard is gorgeous. Nicest keycaps of any board I’ve seen you review. Hope you can get it working sometime.

I hadn’t seen a quite-so-obviously IBM-inspired Honeywell board before.

[chzel]

Just saw this! Great review as always Chyros!
The layout is almost the same as the IBM 3101 beamspring and it's variants, but with 7 extra keys along the bottom row!

Someone should make Honeywell-to-X adaptors....X being beamspring or MX!

[Halvar]

Hmmm, yeah, I understood you guys are getting 1KRO out of it at the moment, but surely it would've had NKRO in its native environment, right? I mean I don't see why it wouldn't Oo .

This hasn't been answered clearly enough I think: No, these were 1KRO in their original environment. For the ones with hold-down switches, the way they were wired up doesn't allow more. For the pulse switches, there wasn't even a way to get key up events, and the concept of NKRO makes no sense without that. The ideas XMIT has for realizing NKRO need more effort and cost than went in back then. I really don't know what xwhatsit was referring to.