An Adaptor for the Character ROM of the Commodore C64 (2332 = 4k). It accepts EPROMs of the types 27C64, 27C128, 27C256 and 27C512.
The charcter sets can be selected by jumper or by a microcontroller circuit like an arduino or the keyboard controlled kernal switch: https://github.com/svenpetersen1965/C64-Keyboard-Controlled-Kernal-Switch
The prices were calculated June 9th, 2020. The total costs for the components and PCB are 3.80€, which does not include and shipping fees.