RCEU2305 - 23C64 to 27C64/27C128 ROM to EPROM adapter

A 23C64 ROM to 27C64/27C128 adapter

Meaning you can add a 27C64 or 27C128 eprom to the adapter, and plug the adapter into one of the rom sockets of i.e. the C64, C128 etc.

To use a 27C64, you only need a 28pin socket and 2 x 12pin male/male sil headers, preferably turned/tulip style.

You can make the adapter into a dual rom, by a 27C128 eprom, a 4k7 - 10k ohm resistor, a wire with a 2 way switch connected to the 2 pin header. This will make you able to switch between 2 roms (each 8kB) in the 16kB eprom.

You can also use this pcb to create an adapter to read the ROM chips in the C64, simply add 2x14pin male/male sil headers in the bottom instead of the 28pin rom socket. and 24pin rom socket on top instead of the 2x12 pin sil headers in the bottom. Basically swap posistions of the socket and the sil haaders.