Trying to identify my mod chip or at least "type" of chip
I bought a used (fat) PS2 recently and was told it had an "early version of PS2 mod chips" where you had to do some disk-swapping with Gameshark. He did not have any details of how to perform this disk-swap because he didn't end up using this disk-swapping method often and has forgotten how. I've been trying to find details of how to perform this disk-swap but it's sort of hard to find because all I come up with in my searches are the (more recent) disk-swapping exploits (but maybe I just need to brush up on my google skills).
Can anyone post me a link or describe to me how this disk-swapping might work?
FYI, it's a V4 PS2, if that helps give a time frame of when the mod chip would have been available...
(BTW, I didn't get scammed, I was buying the system priced as an unmodded system ;))