How to add vi, ps to ramdisk.fs

[bgjung%etri.re.kr@localhost]

Title: How to add vi, ps to ramdisk.fs

ramdisk.fs seems to have limitied functionality.
How to add "vi", "ps" and other usefull commad to ramdisk.fs.
I tyoes to modify ramdiskbin.conf and list file on ramdisk directory.
But it did not work.
Additional steps are needed to add such commands?

- bgjung