[Coco] Arduino as a Mouse/Keyboard interface?

[Frank Swygert]

Mark McDougall wrote:
Anyway, back to the original issue; I still maintain that you cannot 
attach a USB keyboard/mouse to a device that is designed to operate as a 
USB "device". It should be noted, however, that the PS/2 protocol is 
quite trivial, and something that has been bit-bashed on PICs for years. 
No doubt you could use the Arduino to connect PS/2 devices to the Coco. 
Alas, like those before it, PS/2 devices are getting harder to find as 
most of them have been consigned to the IT department junk box, or the 
dumpster.
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USB keyboards can be plugged into a simple adapter and plugged into a 
PS/2 port, so they must have some kind of code detecting the type port, 
or the PS/2 port has some differentiating signal it sends to the 
keyboard and the keyboard switches modes. Couldn't this fact be used to 
implement a keyboard? I know USB mice act the same way, so I don't think 
it's in the keyboard circuitry...

-- 
Frank Swygert
Editor - American Motors Cars Magazine
www.amc-mag.com