RE: TI-H: A/B Switch


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RE: TI-H: A/B Switch




>On Tue, 18 Aug 1998, Gregory Whitmore wrote:
>
>> Well, what I am using it for is to swap between my scanner/printer combo and
>> my quickcam. The scanner has a passthrough for the printer. The quickcam
>> won't work properly behind the passthrough since the scanner and the
>> quickcam both use the TWAIN32 interface. Shouldn't I be able to switch the
>> +5v line? So the device that receives the power from the port would be
>> working.
>
>There isn't a "+5v" line in most parallel ports (that I know of..). There
>are a number of output lines which can be set at 5v and used to provide
>power, and that's probably what Connectix did with the QuickCam. I think
>the best thing to do (short of a second parallel port) would be to get a
>switchbox that switches all 25 lines.

I think Connectix gets their power form the keyboard port which provides +5.

We could make a keyboard/serial UART in one AVR since keyboards use 9600bps
serial.  It would be easy...



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