Help with understanding SNES lockout chip

Discussion of hardware and software development for Super NES and Super Famicom. See the SNESdev wiki for more information.

Moderator: Moderators

Forum rules
  • For making cartridges of your Super NES games, see Reproduction.
Post Reply
meepowl
Posts: 11
Joined: Sat Oct 22, 2022 7:14 am

Help with understanding SNES lockout chip

Post by meepowl »

Hi,

I'm in the process (slowly) of developing an Arduino-based mod-chip for the SNES. @lidnariq has already given me lots of useful help with understanding calls to the region bit in the PPU here viewtopic.php?t=24213.

I'm nearly done with the basic 60Hz/CIC mod but have realised I don't think I understand the CIC as well as I had thought. Various switched-mod guides refer to adding a switch to connect pin 4 to +5V/GND but they don't specify what it's default state is. It looks from this page - https://wiki.superfamicom.org/cic that pin 4 is usually attached to GND but I can't find an actual pinout for the CIC.

Am I right in thinking that with pin 4 attached to GND it operates as normal and attached to +5V it's disabled?

Thanks.
creaothceann
Posts: 611
Joined: Mon Jan 23, 2006 7:47 am
Location: Germany
Contact:

Re: Help with understanding SNES lockout chip

Post by creaothceann »

The schematic shows that pin 4 of the F411 CIC goes to VCC, afaik.
My current setup:
Super Famicom ("2/1/3" SNS-CPU-GPM-02) → SCART → OSSC → StarTech USB3HDCAP → AmaRecTV 3.10
meepowl
Posts: 11
Joined: Sat Oct 22, 2022 7:14 am

Re: Help with understanding SNES lockout chip

Post by meepowl »

Thank you.

Oddly, the opposite of the page here: https://wiki.superfamicom.org/schematic ... y-chip-352.

I'll just have to try it out and see what happens.
Post Reply