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disabling lockout chip
Posted: Fri Aug 10, 2007 6:17 pm
by meshounah
hello i was going to disable the lockout chip but i'm not sure which side is the one i need to snip
from this picture which one do i need to snip?\
i was thinking it as the one right below the i in cic
Posted: Fri Aug 10, 2007 6:34 pm
by atari2600a
It's more of a desolder, pull, & solder to ground than a snip. Also it's pin 4.
Posted: Fri Aug 10, 2007 6:39 pm
by meshounah
ok i can solder so i'll do that but did i get the pin right?
Posted: Fri Aug 10, 2007 6:53 pm
by gannon
Right below the 2 in 8902 IIRC
Posted: Fri Aug 10, 2007 9:54 pm
by Jedi QuestMaster
Posted: Sat Aug 11, 2007 5:31 pm
by commodorejohn
If you don't have soldering equipment and don't have a snipper-type tool small enough, you can do what I did and gradually saw through it with a razor blade.
Posted: Sun Aug 12, 2007 1:31 pm
by MottZilla
From everything I've heard you can leave the pin floating, you don't have to ground it. I've never really heard a good reason for why you'd want to ground it rather than just leave it not connected.
Posted: Sun Aug 12, 2007 7:42 pm
by blargg
I've never really heard a good reason for why you'd want to ground it rather than just leave it not connected.
If it's a CMOS input without any internal pull-down, then it could pick up stray signals and behave erratically. That's a good reason to never leave inputs floating unless you're sure they have an internal pull-up or pull-down.
Posted: Sun Aug 12, 2007 9:48 pm
by MottZilla
Well thank you, that makes sense now. Soldering one wire isn't so bad. I imagine you could actually solder it to the ground on the chip itself if you wanted. One short little wire then.
Posted: Mon Aug 13, 2007 2:47 am
by Bregalad
Cutting pin 4 always worked fine for me, and this doesn't really disable the lockout chip but just made it behave differently.
Posted: Thu Aug 30, 2007 2:29 am
by kevtris
MottZilla wrote:From everything I've heard you can leave the pin floating, you don't have to ground it. I've never really heard a good reason for why you'd want to ground it rather than just leave it not connected.
Correct- you CAN leave the pin floating. It has an internal pulldown on it. So cut your pin 4's and be happy
Cutting pin 4 will turn the lock into a key, which completely disables it.
Posted: Thu Aug 30, 2007 3:59 pm
by atari2600a
Ah, so THAT'S how that works!
Posted: Fri Aug 31, 2007 6:05 am
by Jeroen
If you really wanted you could desolder it and solder two wires for the reset. But it's just inpractical.
Posted: Fri Aug 31, 2007 4:02 pm
by kevtris
Jeroen wrote:If you really wanted you could desolder it and solder two wires for the reset. But it's just inpractical.
It won't work. You have to invert the reset line for it to function properly (the button is active high, the /RST line is active low). By far easier to simply cut pin 4.
Posted: Fri Aug 31, 2007 4:23 pm
by tepples
kevtris wrote:You have to invert the reset line for it to function properly (the button is active high, the /RST line is active low). By far easier to simply cut pin 4.
Unless you're modding NES systems for region free and keeping the CICs to solder onto repros. Then wouldn't you be able to replace the CIC with a hex inverter and a bit of wire?