You will need:
- A 27C256 EPROM - Binary image of the C64C kernel (16KB) - Binary image of the C64 BASIC ROM 901226-01 (8KB) - Binary image of JiffyDOS (8KB)
Concatenate them together in this order: kernel + basic + jiffy images. E.g.:
$ cat „kernel.bin” „basic.bin” „jiffy.bin” > system.bin
Burn it to a blank EPROM.
Lift up pin #27 of the EPROM.