Added a 8x8 LED matrix to the circuit in Logisim, already showing simple animations. I'm not sure if this part should be implemented in real hardware, or skip to a VGA output...

The problem is that the LED matrix haven't any kind of memory, so I'm using a handful of registers to store actual display state. It will be a lot of IC's in real world, doesn't look much like an elegant solution. Maybe I could map screen memory in the RAM and use a fast clock to always refresh the display. We'll see.

Some changes in OUT instruction were needed, all test programs were reassembled (painful and boring task), but all working fine right now.

Next step is to implement an input device (keyboard or joystick) in Logisim, to make the first draft of a game, maybe a Tetris clone.

PS. Now I have all parts necessary to make the CPU in breadboards, maybe next weekend will see big progress.

Thanks for reading.