I forgot (and had never tried) that you can partition the hard drive on a Mac and run windows in one partition while retaining the Mac OS on the other partition. I did that yesterday and was able to download all the firmware updates I needed for the Alpine in my RV so I went ahead and ordered the Service Manual CDs. Hopefully they will work too and I won't have to buy another computer.
Thanks for the find, I had given up on having a service manual. Now I won't be bending everyone's ear on this forum quite so much.
As an added bonus, the manuals also cover our Mercedes SLK and Sprinter based RV so I'll be using them a lot!