There's a nice write-up over on the Furrtek site about modding the 1990's-era VirtualBoy table-top video game console. The VB provides a 3D gaming experience using two scanned LED arrays, one for each eye. A XuLA-200 was inserted into the VB's case in order to generate VGA signals so the game action could be seen on an external monitor.
Here's a preliminary connection of the VB to the XuLa through a level-shifting resistor network:
Finally, it was all crammed together into this:
In addition to adding the XuLA-200, a lot of reverse-engineering (including die photos!) was done to determine how the pixel data was going to the LED arrays so it could be buffered and sent to a VGA monitor. It's worth looking at for the debugging techniques alone.Share on Twitter Share on Facebook Share on Reddit