The ROM’s in the C64 and the original 1541 models are 24 pin and are not directly pin compatible with burnable 2732 or 2764 EPROMS. In order to upgrade to a newer ROM revision or change the ROM to something else and use either a 2732 (for the character set) or 2764 (for kernal/DOS) EPROM, a socket adapter must be built. See here for detailed instructions on how to build one.
Socket adapters are required on the original C64 and 1541 models when replacing the existing 24-pin ROM with a 28-pin EPROM, like a 2764 or larger. They are also needed if you want to replace a 2764 with a larger 27128, a 27128 with a 27256 or a 27256 with a 27512. All of these adapters are covered here.
This is a cool programming “framework” that was adapted for the C64, and was intended to allow programmers and users to easily create and use programs across multiple platforms freely.
Here is a curated list of known C64 kernal and character ROMs. The list will be updated whenever new information becomes available. Some require additional hardware or mods, some do not. Details are provided wherever possible.
A backup archive of another C64 software site (mostly related to interfacing with DOS/Win systems)
C64C (true C short board) – CHIPS vs COMMON SYMPTOMS
C64 CHIPS and COMMON SYMPTOMS