[Coco] The RAT Graphics Mouse

[Neil Morrison]

----- Original Message ----- 
From: "tim lindner" <tlindner at ix.netcom.com>


> Michael Crawford recently sent me a CoCo mouse to reverse engineer. It
> was sold with Diecom's The RAT Graphics package:
>
> http://home.netcom.com/~tlindner/TheRat.html
>
> It appears to an OEM PC mouse from about the 1987 era. The quadrature
> encoding wheels have been hacked to encoding an analog signal sent
> directly to the CoCo. The four values it cycles thru are:
>
>    15, 24, 42, 15
>
> The faster you move the mouse, the faster the numbers cycle.

Odd numbers. Looks like a Gray Code. I'm surprised there aren't more values.

NM