price: 20 GBP platforms: C16
Conversion board and an EPROM. (Supply your own 6510.)
The 6510 is more easily obtainable and more reliable than the 8501 CPU originally fitted to the C16.
Just plug the conversion board fitted with your 6510 into the 8501 CPU socket of the Commodore 16 and replace the Kernal ROM U4 with the EPROM supplied.
The C16 will work as before. The only things lost are the ability for the computer to stop the tape deck and turbo disk loaders won't run.
Compatible with the 1541 disk drive, SD2IEC and many others.
Find out more / buy at: https://ebay.us/XtbHDA