Thank you all ! :-)
That's done, the PCB is finalized. These last days, I worked on the optimization of the 4 layers routing, the density of the components (see below) prevent any automatic PCB routers to work well, so I had to manually re-work an important part of the traces design.
Maybe, wou have noticed a little logo near the name of the computer, it's a piece of coal. Souvenirs... :-)
Updated picture of the motherboard (v2.6): http://www.ti99.com/...tiny994av26.jpg
The official web page: http://www.ti99.com/...8/tiny-99-4a-v2
Edited by fabrice montupet, Sat Jan 27, 2018 10:08 AM.