RCEU/RCEU2305-23c64-to-27c64_128-adapter
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A 23C64 ROM to 27C64/27C128 adapter
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README.md

23c64-to-27c64_128-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 sil headers, preferably turned / tulip.

To use a 27C128, you need 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 rom files (each 8kB) in the 16kB eprom.

You can buy the adapter here: https://restore-store.de/