Hi !!! It's me again.... I've already told you I'm beginning to use Alliance for a project in the university.... so I ask you to pardon me if I'm asking a lot... so... I have another problem, and it's when I use "ring": the message that appears when I use: "$ring anyfile anyfile" is: .... o reading netlists, layout views of core and pads. o reading file of parameters, including the placements of pads. Segmentation fault (core dumped) ... and I don't know what can I do... is my operating system ??? the problem could be inssuficiet memory... but I have 128 MB... could be the processor... but Is a Pentium II (400 Mhz)... I have enough space on disk... what can it be ??? THANKS FOR YOUR HELP Diego Montoya.