Doug McNutt wrote:
>
>
> Your cabling must be OK if the cursor moves on the screen. The RJ telephone 
> connectors have four pins but only three are used for the Apple Desktop Bus. 
> The fourth is for starting up from the keyboard.
>
> The other wires are ground, plus 5 volts, and data. Pressing the button 
> creates encoded bits on the same data line that the keys do.
>
> Exactly where on the screen are you pressing the mouse key? If there is no 
> "button" present where you click the running software is supposed to do 
> nothing except possibly yield to another program if you click in a non-active 
> window.
>
> Can you get to the control panels from an Apple Menu? Is the system still 
> trying to boot? If so there may not yet be any software to recognize a click.
>
>   

the Mac Plus does not have ADB

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