Optical Mouse for Amiga

In case someone is interested in having an optical mouse for their Amiga.

You can either buy a replacement PCB for your existing Amiga mouse. Or 
you can check your 'pile of mice' (I bet everyone has one) if there is 
one among them that uses an Agilent A2051 optical sensor. The datasheet 
for it is available online.

That sensor has not only a serial interface but will also produce the 
same signals as the sensors of a mechanical mouse on pin 2 to 5 (*). So 
all you need to do, if you have one of those, is to remove the 
microcontroller that converts the sensor output to USB and use a 9 wire 
cable hooked up to the 4 sensor outputs and the 3 buttons plus a 9pin 
sub D connector to convert such a mouse to become compatible with the Amiga.

I also had to bridge a transistor that controlled the power supply for 
the A2051 for when the computer is in standby.

Nowadays, the sensors contain the USB interface directly, so you need to 
dig deeper into the pile for the older stuff.

(*) I bet this was to make it easy to convert existing mouse controller 
designs from mechanical to optical.

  Gerrit