To configure an HP jetdirect card do this:
(this worked on a laserjet 4m)
1. Hit the offline button
2. hit the menu button until you get TEST
3. hit the item button until you get SELF TEST
4. hit the enter button ( you will see 05 SELF TEST in the
   window). After about 10 seconds or so the printer will
   print out a page of info. In this info will be the 
   ip address of the card. On mine it is on the right
   side in the middle of the page. If you can, it will
   be easiest to telnet to this ip address and there 
   you will find a simple menu that is very easy to use.
   The card can be configured from there.Then go to 
   the printer configuration on your 
   GNU/Linux workstation printing configuration menu and set it 
   for jetdirect. If you follow the directions there, you should
   have no trouble with the configuration. After entering the ip address
   and the name of the printer it worked first time for me.
   You can also configure the ip address from the 
   printer.

To configure TCP/IP from the printer:
(The star means selected or entered; without the star
   the choice you make is not saved; hit enter to get the star and save your choice)
1. Hit the offline button
2. Hit the menu button until you see AUX IO MENU
3. Hit the item button until you see CFG NETWORK = NO
4. Hit the + button to get CFG NETWORK = YES
5. Hit the enter button to get 	CFG NETWORK = YES *(this saves your choice)
6. Hit the item button to get CFG TCP/IP = NO
7. Hit the + button to get CFG TCP/IP = YES
8. Hit the enter button to get CFG TCP/IP = YES *(this saves your choice)
9. Hit the item button to get IP BYTE 1 = 0
   (This could be any number between 0 and 255, 
    hitting plus increases the number in steps of
    1 hold the plus button down to automatically 
    advance the numbers. Hold down the shift button
    red letters to make numbers go backwards this is 
    where you set the ip address of the printer. This
    number will be the first number in your address
    like this: 192.168.1.1, this will be the 192 part.
    before you hit the the item button again to get to
    IP BYTE 2 = 0 (or what ever number it is set to) be
    sure you have hit enter to change the entry and save it.
10. Hit the item button to get IP BYTE 2 = 0
11. Hit the item button to get IP BYTE 3 = 0
12. Hit the itme button to get IP BYTE 4 = 0
13. As you continue to hit the item button you will
    get something like this SM BYTE =  or LS BYTE = 
    or GW BYTE =  these stand for Subnet Mask, GateWay
    SysLoGserver. You may want to set these too. Again,
    be sure to hit enter to get the * which means you
    have saved the value. You can always test your 
    entry procedure by using the test menu above
    that will tell you if you successfully changed the
    ip address, subnet mask, and defalult gateway.
    Both these methods worked for me. I hope they work
    for you. If you are using dhcp there is a menu for
    that too. I believe it is bootp.