PS/2 Keyboard adapter for TRS-80?

On 1/18/2012 4:14 PM, Curt Vendel wrote: matrix KB to USB is indeed very easy. As you note, M8 is easily doable (LUFA + the KB connector of choice and some glue code). The other way requires host mode functionality. Chuck, I'll admit I did not see the limited Host mode support in LUFA, but I did see the EE project. I dloaded the code, and it's definitely a college project :-). I decided against trying to refactor the code into something usable. In my case, as I redesign C=Key, I have some other goals in mind: * field upgradable via USB port * Support for hose and device mode (current C=Key operates in both directions as well) * Minimal parts count (I'm aware of the VNC1L and such, but they are pricey for what they offer) Since DIP/TH packaging is not a requirement for me, and minimal parts count and small size is, I am leaning towards a small OTG-capable ARM variant for the new design. They are reasonably inexpensive, and offer all of capabilities I feel are needed. I would enjoy a cheaper Xpoint switch option, but perhaps that is asking too much. Dual Port RAM is cheaper, but some apps depend on the interesting effects of "n" key rollover, which is harder to replicate in a dual port RAM setup. Of course, I think the C64, which can scan either way, dual purposes the row and column lines for joysticks, and uses two of the lines to select paddles, is an extreme case, but it's a challenging case nonetheless. TRS-80 M4 does indeed seem easier to support. Jim