Grabbed a track03.iso with my serial slave-now?
 

Ok, the dreamcast ran for 12 hours and gave me a nice zip file which then gave me a file track03.iso What's the easiest route now? I've got every burner program and all kinds of tools etc... Obviously this image(which is supposedly in Disc Juggler format) didn't work in the dreamcast because it's missing a boot portion?. Help please. FTE

I think you've rushed in and not took time to read what you are supposed to do with the file you have transferred to your PC.

You need to extract the file 'track03.iso' using 'extract track03.iso' at the ms-dos prompt.

You must then edit all bin files with text string CD001 (search using windows search, with text CD001)
eg:-

to edit 1st_read.bin

dahack 1st_read.bin 0

the above is standard but there may be others such as

maigo.bin

so, dahack maigo.bin 0

then use binhack to set ip.bin to 0

burn to CD and this will need boot disk

You can convert it to self-boot but I suggest trying the above first as it is time consuming to write selfbooting coasters.