It is possible to extract RISC OS in ROM image form from a computer running RISC OS natively.
You can extract a ROM image using the below command from a command prompt or task window (F12 to access the command line):
*save rom 3800000 3c00000
If the above command doesn’t work, it may be required to run a command that saves RISC OS using multiple commands, one for each megabyte of the operating system. The below command is relevant for RISC OS 4:
*save rom1 3800000 3900000 *save rom2 3900000 3a00000 *save rom3 3a00000 3b00000 *save rom4 3b00000 3c00000