Openschemes

Sadly, we forgot a few BabyFinder commands in our first article about it.   BabyFinder also has some file handling tools used to open, read, get and set the file position, and write.   However writing seems to only write junk instead of useful data.   We’ll check more into that later.

But for those of you who are currently exploring EJFM, you won’t want to forget these additional unlisted commands.

open      
- Open a file

getpos                                
- Get file position

pos        
- Set file position

eof                                 . . . → Read More: A Few More BabyFinder commands

As was discussed in prior articles, the REB1200 has a special mode called EJFM that can be used as a low-level file manager for toying around with the hardware.   In addition, EJFM has a terminal mode called BabyFinder that includes some of the menu commands such as cd as well as other more powerful commands.   This article presents an overview of the command set and how to use it.

NOTE: Since some of the commands are security related, we’ll take the opportunity here to mention that in NO WAY will we discuss how to subvert DRM on the device.   In fact, even if we knew your device’s key we would still have no way of helping you bypass or remove DRM from old content.   So don’t even ask.   If you need to back up books that are no longer supported by Gemstar, there are above-boards methods of doing so.

Moving right along –   I can’t be sure that this is the complete set of BabyFinder commands, but it’s certainly more than the software will let on.

Aside from the normal cd, ls, cat type commands, BabyFinder has some more powerful commands as well as a whole tier of security related commands that are not available unless you are operating under a special authorization.   It looks like we never really figured out HOW to get authorized way back when, but the point is moot.   By patching the authorization routine to always agree that you are the top-tier user, you are free to use any of the commands regardless of their status.

By typing help or ? at the BabyFinder prompt you will get a list of commands that you are allowed to use.   If you have special authorization, then the help command will list a few more encryption-related commands.   But there are, in fact, a few more unlisted commands that can only be found by disassembling the command interpreter and looking for every possible command that can be processed.   The following list includes all tiers – normal, authorized, and unlisted.   Enjoy.

BabyFinder Command List – Circa 2002 or so…

cat
- Type the specified file.

cd
- Change the default directory.

cp
- Create a copy of a file.

crypttest
- Run AES enc/dec test on random data. [auth, unlisted]

cs[]
- Get/set content secret. [auth]

debug
- Type debug information

dir[-l]
- List the current directory.

Continued on Next Page…  

This is our second article on the commands in the REB1200 EJFM mode.   Please refer to the first article for more background information.

The second page of the EJFM menu is the “Execute Command” page, launched by tapping the menu key while in EJFM.   It includes some more involved routines than found on the first page, and can continue branching into a third menu for CF routines alone.

Fig 1 – Second Page of the EJFM Commands

Again, our most sincere apologies for the terrible pic.   As before, we will start at the top left, moving to the right then moving down.

Draw – Just that – starts a drawing routine for budding artists to sketch their masterpieces.   . . . → Read More: REB1200 EJFM, an Overview – Second Page Commands