1. How to mount cdrom drive ?
      When I run command mount, I always get the message like this :
  
      root@pentium[2]> mount -t cd9660 /dev/cd0a /cdrom
      cd9660: Read-only file system   

Try adding `-o ro'..

mount -o ro -t cd9660 /dev/cd0a /cdrom

I'll let someone else answer #2.

   3. I can't print trough my lpt0. (maybe) it cause of there is no
   lpt0 detected when pc is booting. 

Correct; if lpt0 isn't detected by autoconfig during boot, then
there's no chance that printing to it will work..

   I checked the kernel
   configuretion file, the lpt0 is already defined in this file. What
   can I do to fix it ?

Check the line in the config file vs. the jumper settings on the card
or motherboard or (more likely in recent PC's) settings in the BIOS
setup screens.

					- Bill