You can use the PS1 variable as follows:
PS1="\$PWD =>"
That would at least get your location in the Unix prompt string. To avoid having to set this variable each time you login, you could set the variable in your .profile.
As far as the system name you should be able to include uname in the above string as follows:
PS1="'uname -n' \$PWD =>"
However, I've actually not been able to successfully include my system name using the above way, anyone have an answer to that?