After being gypped on ebay with a JiffyDOS ROM for my 1541-II I'm thinking about creating my own. I know where to get the .bin files from and the EPROM writer and EPROM but from something I read I have to write the standard 1541-II ROM to the lower half and the JiffyDOS rom to the upper half and I was wondering if this was easy to do? (the article where I got the info from is here.)