ROM/IPL replacement / Non-Nintendo mem cards

Hello,

I'm working on  ROM/IPL replacement (for linux o/c, NOT for games),
something like tmbinc has done. I think I will try to develop a little
circuit with flash rom on board, but for now I'd like to use tmbinc's
solution: a memory card with the code. I know Nintendo cards are locked,
and it is not yet known (in public) how to unlock them. I don't have a
Datel Action Replay card, which does not need unlocking, but a cheap €9
Piranha card, and I would like to investigate whether this one is locked
on boot.

I wrote a little program which reads the ID from the mem card, and
prints to screen. When I use it, it prints 00 00 00 10 (251 blocks
card). When I remove the card, it reads ff ff ff ff, and when I reinsert
it, it reads 00 00 00 00. Since this is different from 00 00 00 10, I
would say: this card does have a locking mechanism. Now, would someone
who has a Action Replay spent 5 minutes to repeat this experiment?

The dol file can be found at
home.student.utwente.nl/r.reilink/files/main.dol

Rob



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