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I just managed to unmod CDTV keyboard (swapped wires for CD32) with community's help, but the original wire was gone, so I'm left without _KBSE signal connected. It seems the system doesn't mind.
What is the purpose of Keyboard Sense in this (and other) system(s)?
Keyboard sense is simply so the CDTV can detect if a keyboard is attached. The keyboard is an optional feature.
After all, the CDTV is a game console. and games should be plug and play. Having to go thru various setup options, eventually every time playing is not really a great idea. By enabling games to detect keyboard presence they can enable and show options for it, otherwise hidden.
