On 04/18/2018 06:01 PM, Jules Richardson via cctalk wrote:
However, the keyboard appears unresponsive. Pressing keys (with the exception of caps-lock, the two shifts, and ctrl) results in a buzz/click from within the keyboard - if I'm interpreting the schematics right, the click is actually driven by the system in response to a keypress, which suggests that my keyswitches are OK (I believe these use a foam disc approach, which are prone to deterioration) and that keyboard data is being received OK (at least on some low level).
And we're good. It was a simple cable fault. Turns out that while the system does have the ability to make noise by sending data out to the keyboard, the keyboard click noise is generated solely within the keyboard unit - so although my +5V and ground lines on the keyboard cable were fine, the data line was not, and nothing was ever getting through to the system.
I need to find a better replacement cable - the phone handset cord I'm using right now is too short - but at least the system seems healthy. Onto the cosmetics...
cheers Jules
