This is a Kernal Adapter/Switch for the Commodore C64 long board prior to ASSY250469. The kernal selection can be configured with jumpers, a switch or even with a micro controller. +5V are provided on the pin header for this purpose.
This adapter is also suitable for the 1541 Floppy Disk ROM.
This development was inspired by Adrian Black's youtube video How-To: C64 Arduino based Restore Key/Four Kernal Switcher/Hard Reset
This board revision provides and optional pin header with the address bits A5 and A8 for stereo SID application.
The component prices of the BOM 0.0 were summed up. The total is 3.81€, which does not include and shipping fees.