[Coco] WICO Command Trackball

[Joel Ewy]

Torsten Dittel wrote:
>> for those interested in the full PDF send me a private message
>>     
>
> I just had a closer look at the patent file and my conclusion is:
>
> 1) The Motorola SC87152P has nothing to do with the Intel 8052 family
> 2) It is rather a custom chip based on the 6805 family
>   
That makes more sense to me!
> 3) Outputs of the patented design in "counter mode" are 8-bit x & y
> coordinates (has to be proved if the CoCo version of the WICO trackball
> is using 6 bit or 8 bit) which are converted to analog voltages by an
> external R/2R ladder network
> 4) The design has an interesting second mode (not used in the CoCo
> version) which will output pulse width modulated Up/Down and Left/Right
> digital signals
>
>   
Makes one wonder if it could have been used to drive hobby servos.
> I guess my next step of "hacking" the device is trying to use the
> adaptor inside the trackball to connect an ATARI ST type (digital, not
> serial) mouse to the CoCoMax Pak.
>
>   
Sounds like an interesting investigation.
> Regards,
> Torsten
>
>
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>