I've read up on other people trying to mod a SNES to suit this revision of the security chip here
and wanted to see if I could get a definitive answer. I've successfully added the 50/60hz switch as this SNES had the separate PPU chips, it's just the lockout that's causing issues.
When I feed the security chip +5v from the voltage regulator, it runs fine, but it obviously won't even show up anything on the TV with imports
When I feed it GND, it doesn't load up. From what I've read here, that means the machine's in a constant state of reset and is in line with the F413B revision of the security chip at U8.
So, from what others have found out, I have two options. The first is the "silver" mod, where I remove the whole F413B chip and solder a connection from pin 10 from where the F413B chip used to be to pin 4 on the chip U10 (source
). The problem is if this doesn't work, re-adding the security chip with those little legs will be painful
Second option was from this site
that simonbelmont2 mentioned in one of the threads linked to above. I don't understand French, but the gist of the setup for tackling the security IC via a DPDT switch is as follows:
[not connected] -- 1 | 1 -- [not connected]
U18, pin 7 (lifted) -- 2 | 2 -- U8 (F413B), pin 4 (lifted)
Cart slot, pin 56 -- 3 | 3 -- 5v from voltage regulator via a 2.2kOhm resistor
This appeals to me more as it doesn't involve the complete removal of the security chip, and I happened to have a DPDT switch already in there (I didn't have any SPDT switches handy
). The question is - should this work, or if anyone has tried this before?
Of course there's option 3 - gutting the security IC from another SNES cart and use this
guide as a basis for wiring the two together. I don't have any spare SNES games I'm willing to gut, and would prefer either of the other two options.
If anyone can lend their wisdom, I'd appreciate it. I just wish the console had an earlier revision security IC so it wouldn't have to be extra complicated to do this