The CSG8701 (previously called MOS8701) is a custom timing generator chip for C64 and C128 computers.
Our replacement board does not only contain a replica of the original PLL circuit, but also the crystal. While the original chip took it's PAL/NTSC setting from the jumper wire on the C64 main board, there are three different versions of our replica board: A PAL and an NTSC version, and a new PAL/NTSC switchable version. The advantage of putting everything on one board is that you can use it for repair jobs without having to check the original crystal. Further, a PAL/NTSC modding job gets significantly easier, because no need to solder at all.