Thanks Guys ! I moved to a new house and had not time to work on this machine, but this afternoon i had some spare time to work on it.
$ sysctl -a hw.model
hw.model: Geode(TM) Integrated Processor by National Semi
$ cat /var/run/dmesg.boot
cat: /var/run/dmesg.boot: No such file or directory
At last dmesg helped :
CPU: Geode(TM) Integrated Processor by National Semi (300.68-MHz 586-class CPU)