![]() Of course, use of full-sized keyboard controller in DIP case is not possible because of mentioned space problem: you'll need a PCB with 'epoxy blob' variant. This method isn't as good as real HID mouse button code generation (button function is hardwired and cannot be reassigned in software), but in my case is completely sufficient to my needs. For me, the most wanted purpose of that button would be a "Back" function - so, it's possible to hook a keyboard controller and use "Backspace" key scan code for that, interpreted by web browsers and file managers as "back" command. The idea was, to use second channel of common PS2/USB adapter for handling 4th. It forced me to implement another approach for that task. There's quite limited space inside trackball case for additional circuits, so ordinary Arduino/Teensy-based converter was not an option at that time. button (small red one) is a biggest problem with this trackball nowadays, as it requires real PS/2 port for proper initialization (in other words, no way to use it via common PS/2-USB converter), or proprietary driver support in serial mode - and such drivers for modern OSes are non-existent.Īs I dislike to have partially-working device, I've decided to modify trackball electronics to "unlock" the red button. Marble FX's combo PS/2-serial interface is outdated. ![]()
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