On Feb 7, 2006, at 1:17 PM, Peter wrote:

>> But really, a circuit like that hooked up to
>> a serial port with the clock derived from a one-shot...
>
> How about two phototransistors suction cupped to the monitor
> screen and a program to flash two rectangles in the right seuqence ?

I had a remarkably similar thought myself, although I was going
to use CDS photocells...  We're all sick.

Maybe we should just do it?  It probably takes at least 3 signals,
doesn't it?

BillW

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