connected AVCC to VCC as recommended by the mega88-spec, route 34 vias
modified placement and trace thickness, routed with 31 vias
added CL-PI filter to suppress wire coupled noise from ICL7660 to 9V input, unrouted
routed: 37 vias
route, 36 vias
optimizing manually, 35 vias
optimizing manually, added short in c49e595, removed it, 36 vias
route, 35 vias