It was a GPIO port you could wire stuff into, think it even had ADC's and DAC's for analog signals. The case mounted LED CPU meter bars were sick - like an 80's amplifier VU meter. Amazing bit of kit those machines - true hacker boxen.
It wasn't really. It was just another closed platform. BeBox had a real struggle to boot anything but BeOS and the platform was so poorly documented that other than the manuals that came with it and the few brief descriptions in Be Newsletters, there is no real public documentation about any of the hardware. It was also smoke and mirrors, it barely worked in MP mode because the 603's they used didn't do proper MP. There was a software process that had to work around this, which then slowed down the OS in general. The dual processor Mac's with 604's actually ran rings around the BeBox performance wise.
